DEBT AND CREDIT FACILITIES (Schedule Of Long-Term Debt) (Details) (USD $)
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3 Months Ended |
12 Months Ended |
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Dec. 31, 2014
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Dec. 31, 2014
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Dec. 31, 2013
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Sep. 30, 2014
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Debt Instrument [Line Items] |
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Maximum Impairment Permitted to be Excluded from Net Worth Calculation for Debt Covenants |
$ 1,000,000,000clf_MaximumImpairmentPermittedtobeExcludedfromNetWorthCalculationforDebtCovenants
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$ 1,000,000,000clf_MaximumImpairmentPermittedtobeExcludedfromNetWorthCalculationforDebtCovenants
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Stock Repurchase Program, Authorized Amount |
200,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
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200,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
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Debt Instrument, Par Value |
4,144,800,000clf_DebtInstrumentParValue
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4,144,800,000clf_DebtInstrumentParValue
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4,814,800,000clf_DebtInstrumentParValue
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Long-term Debt |
2,984,100,000us-gaap_LongTermDebt
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2,984,100,000us-gaap_LongTermDebt
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3,043,500,000us-gaap_LongTermDebt
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Current portion of long-term debt |
21,800,000us-gaap_LongTermDebtCurrent
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21,800,000us-gaap_LongTermDebtCurrent
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20,900,000us-gaap_LongTermDebtCurrent
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Long-term debt noncurrent portion |
2,962,300,000us-gaap_LongTermDebtNoncurrent
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2,962,300,000us-gaap_LongTermDebtNoncurrent
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3,022,600,000us-gaap_LongTermDebtNoncurrent
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Seven Hundred Million Four Point Eight Seven Five Two Thousand Twenty-one Senior Note [Member] |
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Debt Instrument [Line Items] |
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Debt Instrument, Repurchased Face Amount |
10,000,000us-gaap_DebtInstrumentRepurchasedFaceAmount / us-gaap_DebtInstrumentAxis = clf_SevenHundredMillionFourPointEightSevenFiveTwoThousandTwentyoneSeniorNoteMember
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10,000,000us-gaap_DebtInstrumentRepurchasedFaceAmount / us-gaap_DebtInstrumentAxis = clf_SevenHundredMillionFourPointEightSevenFiveTwoThousandTwentyoneSeniorNoteMember
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Stated interest rate |
4.875%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = clf_SevenHundredMillionFourPointEightSevenFiveTwoThousandTwentyoneSeniorNoteMember
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4.875%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = clf_SevenHundredMillionFourPointEightSevenFiveTwoThousandTwentyoneSeniorNoteMember
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Debt Instrument, Par Value |
690,000,000clf_DebtInstrumentParValue / us-gaap_DebtInstrumentAxis = clf_SevenHundredMillionFourPointEightSevenFiveTwoThousandTwentyoneSeniorNoteMember
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690,000,000clf_DebtInstrumentParValue / us-gaap_DebtInstrumentAxis = clf_SevenHundredMillionFourPointEightSevenFiveTwoThousandTwentyoneSeniorNoteMember
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700,000,000clf_DebtInstrumentParValue / us-gaap_DebtInstrumentAxis = clf_SevenHundredMillionFourPointEightSevenFiveTwoThousandTwentyoneSeniorNoteMember
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Debt Instrument, Unamortized Discount |
500,000us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = clf_SevenHundredMillionFourPointEightSevenFiveTwoThousandTwentyoneSeniorNoteMember
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500,000us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = clf_SevenHundredMillionFourPointEightSevenFiveTwoThousandTwentyoneSeniorNoteMember
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600,000us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = clf_SevenHundredMillionFourPointEightSevenFiveTwoThousandTwentyoneSeniorNoteMember
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Debt Repurchase Discount |
40.50%clf_DebtRepurchaseDiscount / us-gaap_DebtInstrumentAxis = clf_SevenHundredMillionFourPointEightSevenFiveTwoThousandTwentyoneSeniorNoteMember
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40.50%clf_DebtRepurchaseDiscount / us-gaap_DebtInstrumentAxis = clf_SevenHundredMillionFourPointEightSevenFiveTwoThousandTwentyoneSeniorNoteMember
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Gains (Losses) on Extinguishment of Debt |
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4,100,000us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_DebtInstrumentAxis = clf_SevenHundredMillionFourPointEightSevenFiveTwoThousandTwentyoneSeniorNoteMember
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Type |
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Fixed
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Fixed
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Final Maturity |
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2021
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2021
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Long-term Debt |
689,500,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = clf_SevenHundredMillionFourPointEightSevenFiveTwoThousandTwentyoneSeniorNoteMember
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[1] |
689,500,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = clf_SevenHundredMillionFourPointEightSevenFiveTwoThousandTwentyoneSeniorNoteMember
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[1] |
699,400,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = clf_SevenHundredMillionFourPointEightSevenFiveTwoThousandTwentyoneSeniorNoteMember
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[1] |
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Imputed interest rate |
4.88%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = clf_SevenHundredMillionFourPointEightSevenFiveTwoThousandTwentyoneSeniorNoteMember
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4.88%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = clf_SevenHundredMillionFourPointEightSevenFiveTwoThousandTwentyoneSeniorNoteMember
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4.88%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = clf_SevenHundredMillionFourPointEightSevenFiveTwoThousandTwentyoneSeniorNoteMember
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Debt Instrument, Face Amount |
700,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = clf_SevenHundredMillionFourPointEightSevenFiveTwoThousandTwentyoneSeniorNoteMember
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700,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = clf_SevenHundredMillionFourPointEightSevenFiveTwoThousandTwentyoneSeniorNoteMember
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700,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = clf_SevenHundredMillionFourPointEightSevenFiveTwoThousandTwentyoneSeniorNoteMember
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$500 million 4.80% 2020 Senior Notes [Member] |
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Debt Instrument [Line Items] |
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Debt Instrument, Repurchased Face Amount |
10,000,000us-gaap_DebtInstrumentRepurchasedFaceAmount / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionFourPointEightZeroPercentSeniorNoteMember
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10,000,000us-gaap_DebtInstrumentRepurchasedFaceAmount / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionFourPointEightZeroPercentSeniorNoteMember
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Stated interest rate |
4.80%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionFourPointEightZeroPercentSeniorNoteMember
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4.80%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionFourPointEightZeroPercentSeniorNoteMember
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4.80%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionFourPointEightZeroPercentSeniorNoteMember
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Debt Instrument, Par Value |
490,000,000clf_DebtInstrumentParValue / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionFourPointEightZeroPercentSeniorNoteMember
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490,000,000clf_DebtInstrumentParValue / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionFourPointEightZeroPercentSeniorNoteMember
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500,000,000clf_DebtInstrumentParValue / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionFourPointEightZeroPercentSeniorNoteMember
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Debt Instrument, Unamortized Discount |
600,000us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionFourPointEightZeroPercentSeniorNoteMember
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600,000us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionFourPointEightZeroPercentSeniorNoteMember
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800,000us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionFourPointEightZeroPercentSeniorNoteMember
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Debt Repurchase Discount |
40.25%clf_DebtRepurchaseDiscount / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionFourPointEightZeroPercentSeniorNoteMember
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40.25%clf_DebtRepurchaseDiscount / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionFourPointEightZeroPercentSeniorNoteMember
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Gains (Losses) on Extinguishment of Debt |
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4,000,000us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionFourPointEightZeroPercentSeniorNoteMember
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Type |
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Fixed
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Fixed
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Final Maturity |
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2020
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2020
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Long-term Debt |
489,400,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionFourPointEightZeroPercentSeniorNoteMember
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[2] |
489,400,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionFourPointEightZeroPercentSeniorNoteMember
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[2] |
499,200,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionFourPointEightZeroPercentSeniorNoteMember
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[2] |
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Imputed interest rate |
4.83%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionFourPointEightZeroPercentSeniorNoteMember
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4.83%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionFourPointEightZeroPercentSeniorNoteMember
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4.83%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionFourPointEightZeroPercentSeniorNoteMember
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Debt Instrument, Face Amount |
500,000,000.0us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionFourPointEightZeroPercentSeniorNoteMember
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500,000,000.0us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionFourPointEightZeroPercentSeniorNoteMember
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500,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionFourPointEightZeroPercentSeniorNoteMember
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Discount Rate Used to Calculate Present Values of Remaining Scheduled Payments of Principal and Interest on Notes to Be Redeemed, Variable Rate Basis |
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treasury rate
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Discount Rate Used to Calculate Present Values of Remaining Scheduled Payments of Principal and Interest on Notes to Be Redeemed, Spread on Rate Basis |
0.35%clf_DiscountRateUsedToCalculatePresentValuesOfRemainingScheduledPaymentsOfPrincipalAndInterestOnNotesToBeRedeemedSpreadOnRateBasis / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionFourPointEightZeroPercentSeniorNoteMember
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0.35%clf_DiscountRateUsedToCalculatePresentValuesOfRemainingScheduledPaymentsOfPrincipalAndInterestOnNotesToBeRedeemedSpreadOnRateBasis / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionFourPointEightZeroPercentSeniorNoteMember
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$800 Million 6.25% 2040 Senior Notes [Member] |
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Debt Instrument [Line Items] |
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Stated interest rate |
6.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = clf_EightHundredMillionSixPointTwoFivePercentSeniorNotesDueTwoThousandFortyMember
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6.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = clf_EightHundredMillionSixPointTwoFivePercentSeniorNotesDueTwoThousandFortyMember
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6.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = clf_EightHundredMillionSixPointTwoFivePercentSeniorNotesDueTwoThousandFortyMember
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Debt Instrument, Par Value |
800,000,000clf_DebtInstrumentParValue / us-gaap_DebtInstrumentAxis = clf_EightHundredMillionSixPointTwoFivePercentSeniorNotesDueTwoThousandFortyMember
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800,000,000clf_DebtInstrumentParValue / us-gaap_DebtInstrumentAxis = clf_EightHundredMillionSixPointTwoFivePercentSeniorNotesDueTwoThousandFortyMember
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800,000,000clf_DebtInstrumentParValue / us-gaap_DebtInstrumentAxis = clf_EightHundredMillionSixPointTwoFivePercentSeniorNotesDueTwoThousandFortyMember
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Debt Instrument, Unamortized Discount |
9,500,000us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = clf_EightHundredMillionSixPointTwoFivePercentSeniorNotesDueTwoThousandFortyMember
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9,500,000us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = clf_EightHundredMillionSixPointTwoFivePercentSeniorNotesDueTwoThousandFortyMember
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9,600,000us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = clf_EightHundredMillionSixPointTwoFivePercentSeniorNotesDueTwoThousandFortyMember
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Type |
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Fixed
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Fixed
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Final Maturity |
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2040
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2040
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Long-term Debt |
790,500,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = clf_EightHundredMillionSixPointTwoFivePercentSeniorNotesDueTwoThousandFortyMember
|
[3] |
790,500,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = clf_EightHundredMillionSixPointTwoFivePercentSeniorNotesDueTwoThousandFortyMember
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[3] |
790,400,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = clf_EightHundredMillionSixPointTwoFivePercentSeniorNotesDueTwoThousandFortyMember
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[3] |
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Imputed interest rate |
6.34%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = clf_EightHundredMillionSixPointTwoFivePercentSeniorNotesDueTwoThousandFortyMember
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6.34%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = clf_EightHundredMillionSixPointTwoFivePercentSeniorNotesDueTwoThousandFortyMember
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6.34%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = clf_EightHundredMillionSixPointTwoFivePercentSeniorNotesDueTwoThousandFortyMember
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Debt Instrument, Face Amount |
800,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = clf_EightHundredMillionSixPointTwoFivePercentSeniorNotesDueTwoThousandFortyMember
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800,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = clf_EightHundredMillionSixPointTwoFivePercentSeniorNotesDueTwoThousandFortyMember
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$400 Million 5.90% 2020 Senior Notes [Member] |
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Debt Instrument [Line Items] |
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Debt Instrument, Repurchased Face Amount |
5,000,000us-gaap_DebtInstrumentRepurchasedFaceAmount / us-gaap_DebtInstrumentAxis = clf_FourHundredMillionFivePointNineZeroTwoThousandAndTwentySeniorNoteMember
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5,000,000us-gaap_DebtInstrumentRepurchasedFaceAmount / us-gaap_DebtInstrumentAxis = clf_FourHundredMillionFivePointNineZeroTwoThousandAndTwentySeniorNoteMember
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Stated interest rate |
5.90%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = clf_FourHundredMillionFivePointNineZeroTwoThousandAndTwentySeniorNoteMember
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5.90%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = clf_FourHundredMillionFivePointNineZeroTwoThousandAndTwentySeniorNoteMember
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5.90%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = clf_FourHundredMillionFivePointNineZeroTwoThousandAndTwentySeniorNoteMember
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Debt Instrument, Par Value |
395,000,000clf_DebtInstrumentParValue / us-gaap_DebtInstrumentAxis = clf_FourHundredMillionFivePointNineZeroTwoThousandAndTwentySeniorNoteMember
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395,000,000clf_DebtInstrumentParValue / us-gaap_DebtInstrumentAxis = clf_FourHundredMillionFivePointNineZeroTwoThousandAndTwentySeniorNoteMember
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400,000,000clf_DebtInstrumentParValue / us-gaap_DebtInstrumentAxis = clf_FourHundredMillionFivePointNineZeroTwoThousandAndTwentySeniorNoteMember
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Debt Instrument, Unamortized Discount |
1,300,000us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = clf_FourHundredMillionFivePointNineZeroTwoThousandAndTwentySeniorNoteMember
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1,300,000us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = clf_FourHundredMillionFivePointNineZeroTwoThousandAndTwentySeniorNoteMember
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1,600,000us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = clf_FourHundredMillionFivePointNineZeroTwoThousandAndTwentySeniorNoteMember
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Debt Repurchase Discount |
38.125%clf_DebtRepurchaseDiscount / us-gaap_DebtInstrumentAxis = clf_FourHundredMillionFivePointNineZeroTwoThousandAndTwentySeniorNoteMember
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38.125%clf_DebtRepurchaseDiscount / us-gaap_DebtInstrumentAxis = clf_FourHundredMillionFivePointNineZeroTwoThousandAndTwentySeniorNoteMember
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Gains (Losses) on Extinguishment of Debt |
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|
1,900,000.0us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_DebtInstrumentAxis = clf_FourHundredMillionFivePointNineZeroTwoThousandAndTwentySeniorNoteMember
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Type |
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Fixed
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Fixed
|
|
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Final Maturity |
|
|
2020
|
|
2020
|
|
|
Long-term Debt |
393,700,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = clf_FourHundredMillionFivePointNineZeroTwoThousandAndTwentySeniorNoteMember
|
[4] |
393,700,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = clf_FourHundredMillionFivePointNineZeroTwoThousandAndTwentySeniorNoteMember
|
[4] |
398,400,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = clf_FourHundredMillionFivePointNineZeroTwoThousandAndTwentySeniorNoteMember
|
[4] |
|
Imputed interest rate |
5.98%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = clf_FourHundredMillionFivePointNineZeroTwoThousandAndTwentySeniorNoteMember
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|
5.98%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = clf_FourHundredMillionFivePointNineZeroTwoThousandAndTwentySeniorNoteMember
|
|
5.98%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = clf_FourHundredMillionFivePointNineZeroTwoThousandAndTwentySeniorNoteMember
|
|
|
Debt Instrument, Face Amount |
400,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = clf_FourHundredMillionFivePointNineZeroTwoThousandAndTwentySeniorNoteMember
|
|
400,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = clf_FourHundredMillionFivePointNineZeroTwoThousandAndTwentySeniorNoteMember
|
|
400,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = clf_FourHundredMillionFivePointNineZeroTwoThousandAndTwentySeniorNoteMember
|
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$500 Million 3.95% 2018 Senior Notes [Member] |
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Debt Instrument [Line Items] |
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Debt Instrument, Repurchased Face Amount |
20,000,000us-gaap_DebtInstrumentRepurchasedFaceAmount / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionThreePointNineFiveTwoThousandEighteenSeniorNoteMember
|
|
20,000,000us-gaap_DebtInstrumentRepurchasedFaceAmount / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionThreePointNineFiveTwoThousandEighteenSeniorNoteMember
|
|
|
|
|
Stated interest rate |
3.95%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionThreePointNineFiveTwoThousandEighteenSeniorNoteMember
|
|
3.95%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionThreePointNineFiveTwoThousandEighteenSeniorNoteMember
|
|
|
|
|
Debt Instrument, Par Value |
480,000,000clf_DebtInstrumentParValue / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionThreePointNineFiveTwoThousandEighteenSeniorNoteMember
|
|
480,000,000clf_DebtInstrumentParValue / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionThreePointNineFiveTwoThousandEighteenSeniorNoteMember
|
|
500,000,000clf_DebtInstrumentParValue / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionThreePointNineFiveTwoThousandEighteenSeniorNoteMember
|
|
|
Debt Instrument, Unamortized Discount |
2,600,000us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionThreePointNineFiveTwoThousandEighteenSeniorNoteMember
|
|
2,600,000us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionThreePointNineFiveTwoThousandEighteenSeniorNoteMember
|
|
3,500,000us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionThreePointNineFiveTwoThousandEighteenSeniorNoteMember
|
|
|
Debt Repurchase Discount |
30.875%clf_DebtRepurchaseDiscount / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionThreePointNineFiveTwoThousandEighteenSeniorNoteMember
|
|
30.875%clf_DebtRepurchaseDiscount / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionThreePointNineFiveTwoThousandEighteenSeniorNoteMember
|
|
|
|
|
Gains (Losses) on Extinguishment of Debt |
|
|
6,200,000us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionThreePointNineFiveTwoThousandEighteenSeniorNoteMember
|
|
|
|
|
Type |
|
|
Fixed
|
|
Fixed
|
|
|
Final Maturity |
|
|
2018
|
|
2018
|
|
|
Long-term Debt |
477,400,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionThreePointNineFiveTwoThousandEighteenSeniorNoteMember
|
[5] |
477,400,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionThreePointNineFiveTwoThousandEighteenSeniorNoteMember
|
[5] |
496,500,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionThreePointNineFiveTwoThousandEighteenSeniorNoteMember
|
[5] |
|
Imputed interest rate |
5.17%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionThreePointNineFiveTwoThousandEighteenSeniorNoteMember
|
|
5.17%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionThreePointNineFiveTwoThousandEighteenSeniorNoteMember
|
|
4.14%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionThreePointNineFiveTwoThousandEighteenSeniorNoteMember
|
|
|
Debt Instrument, Face Amount |
500,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionThreePointNineFiveTwoThousandEighteenSeniorNoteMember
|
|
500,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionThreePointNineFiveTwoThousandEighteenSeniorNoteMember
|
|
500,000,000.0us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionThreePointNineFiveTwoThousandEighteenSeniorNoteMember
|
|
|
Revolving Credit Facility [Member] |
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
Coverage Ratio Of Earnings Before Interest Tax Depreciation And Amortization To Total Interest Expense |
3.5clf_CoverageRatioOfEarningsBeforeInterestTaxDepreciationAndAmortizationToTotalInterestExpense / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember
|
|
|
|
2.5clf_CoverageRatioOfEarningsBeforeInterestTaxDepreciationAndAmortizationToTotalInterestExpense / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember
|
|
|
Coverage Ratio Of Earnings Before Interest Tax Depreciation And Amortization To Total Interest Expense, Subsequent Event - Revolving Credit Facility Amendment |
2.0clf_CoverageRatioOfEarningsBeforeInterestTaxDepreciationAndAmortizationToTotalInterestExpenseSubsequentEventRevolvingCreditFacilityAmendment / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember
|
|
|
|
|
|
|
Number of Days to complete collateral action in order to reduce minimum interest coverage ratio, Subsequent Event - Revolving Credit Facility Amendment |
60clf_NumberofDaystocompletecollateralactioninordertoreduceminimuminterestcoverageratioSubsequentEventRevolvingCreditFacilityAmendment / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember
|
|
|
|
|
|
|
Debt Instrument, Par Value |
1,125,000,000clf_DebtInstrumentParValue / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember
|
|
1,125,000,000clf_DebtInstrumentParValue / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember
|
|
1,750,000,000clf_DebtInstrumentParValue / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember
|
|
1,250,000,000clf_DebtInstrumentParValue / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember
|
Type |
|
|
Variable
|
|
Variable
|
|
|
Final Maturity |
|
|
2017
|
|
2017
|
|
|
Credit facility, amount outstanding |
0us-gaap_LineOfCredit / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember
|
[6] |
0us-gaap_LineOfCredit / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember
|
[6] |
0us-gaap_LineOfCredit / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember
|
[6] |
|
Imputed interest rate |
2.94%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember
|
|
2.94%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember
|
|
1.64%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember
|
|
|
Credit facility remaining capacity |
1,000,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember
|
|
1,000,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember
|
|
1,700,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember
|
|
|
Letter of Credit [Member] |
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
Credit facility, amount outstanding |
149,500,000us-gaap_LineOfCredit / us-gaap_DebtInstrumentAxis = us-gaap_LetterOfCreditMember
|
|
149,500,000us-gaap_LineOfCredit / us-gaap_DebtInstrumentAxis = us-gaap_LetterOfCreditMember
|
|
8,400,000us-gaap_LineOfCredit / us-gaap_DebtInstrumentAxis = us-gaap_LetterOfCreditMember
|
|
|
Equipment Loans [Member] |
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
Debt Instrument, Par Value |
164,800,000clf_DebtInstrumentParValue / us-gaap_DebtInstrumentAxis = clf_EquipmentLoansMember
|
|
164,800,000clf_DebtInstrumentParValue / us-gaap_DebtInstrumentAxis = clf_EquipmentLoansMember
|
|
|
|
|
Type |
|
|
Fixed
|
|
Fixed
|
|
|
Long-term Debt |
140,800,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = clf_EquipmentLoansMember
|
|
140,800,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = clf_EquipmentLoansMember
|
|
161,700,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = clf_EquipmentLoansMember
|
|
|
Interest Rate Swap [Member] |
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
Fair Value Adjustment to Interest Rate Hedge |
2,800,000clf_FairValueAdjustmenttoInterestRateHedge / us-gaap_DebtInstrumentAxis = us-gaap_InterestRateSwapMember
|
|
2,800,000clf_FairValueAdjustmenttoInterestRateHedge / us-gaap_DebtInstrumentAxis = us-gaap_InterestRateSwapMember
|
|
(2,100,000)clf_FairValueAdjustmenttoInterestRateHedge / us-gaap_DebtInstrumentAxis = us-gaap_InterestRateSwapMember
|
|
|
Senior Notes Five Hundred Million [Member] |
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
Discount Rate Used to Calculate Present Values of Remaining Scheduled Payments of Principal and Interest on Notes to Be Redeemed, Variable Rate Basis |
|
|
treasury rate
|
|
|
|
|
Discount Rate Used to Calculate Present Values of Remaining Scheduled Payments of Principal and Interest on Notes to Be Redeemed, Spread on Rate Basis |
0.50%clf_DiscountRateUsedToCalculatePresentValuesOfRemainingScheduledPaymentsOfPrincipalAndInterestOnNotesToBeRedeemedSpreadOnRateBasis / us-gaap_DebtInstrumentAxis = clf_SeniorNotesFiveHundredMillionMember
|
|
0.50%clf_DiscountRateUsedToCalculatePresentValuesOfRemainingScheduledPaymentsOfPrincipalAndInterestOnNotesToBeRedeemedSpreadOnRateBasis / us-gaap_DebtInstrumentAxis = clf_SeniorNotesFiveHundredMillionMember
|
|
|
|
|
Senior Notes10 Year Tranche [Member] |
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
Discount Rate Used to Calculate Present Values of Remaining Scheduled Payments of Principal and Interest on Notes to Be Redeemed, Variable Rate Basis |
|
|
treasury rate
|
|
|
|
|
Discount Rate Used to Calculate Present Values of Remaining Scheduled Payments of Principal and Interest on Notes to Be Redeemed, Spread on Rate Basis |
0.25%clf_DiscountRateUsedToCalculatePresentValuesOfRemainingScheduledPaymentsOfPrincipalAndInterestOnNotesToBeRedeemedSpreadOnRateBasis / us-gaap_DebtInstrumentAxis = clf_SeniorNotes10YearTrancheMember
|
|
0.25%clf_DiscountRateUsedToCalculatePresentValuesOfRemainingScheduledPaymentsOfPrincipalAndInterestOnNotesToBeRedeemedSpreadOnRateBasis / us-gaap_DebtInstrumentAxis = clf_SeniorNotes10YearTrancheMember
|
|
|
|
|
Senior Notes30 Year Tranche [Member] |
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
Debt Instrument, Face Amount |
300,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = clf_ThreeHundredMillionSixPointTwoFivePercentTwoThousandAndFortyMember
|
|
300,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = clf_ThreeHundredMillionSixPointTwoFivePercentTwoThousandAndFortyMember
|
|
|
|
|
Discount Rate Used to Calculate Present Values of Remaining Scheduled Payments of Principal and Interest on Notes to Be Redeemed, Variable Rate Basis |
|
|
treasury rate
|
|
|
|
|
Discount Rate Used to Calculate Present Values of Remaining Scheduled Payments of Principal and Interest on Notes to Be Redeemed, Spread on Rate Basis |
0.40%clf_DiscountRateUsedToCalculatePresentValuesOfRemainingScheduledPaymentsOfPrincipalAndInterestOnNotesToBeRedeemedSpreadOnRateBasis / us-gaap_DebtInstrumentAxis = clf_ThreeHundredMillionSixPointTwoFivePercentTwoThousandAndFortyMember
|
|
0.40%clf_DiscountRateUsedToCalculatePresentValuesOfRemainingScheduledPaymentsOfPrincipalAndInterestOnNotesToBeRedeemedSpreadOnRateBasis / us-gaap_DebtInstrumentAxis = clf_ThreeHundredMillionSixPointTwoFivePercentTwoThousandAndFortyMember
|
|
|
|
|
Five Hundred Million Six Point Two Five Percent Two Thousand And Forty [Member] |
|
|
|
|
|
|
|
Debt Instrument [Line Items] |
|
|
|
|
|
|
|
Debt Instrument, Face Amount |
$ 500,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionSixPointTwoFivePercentTwoThousandAndFortyMember
|
|
$ 500,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionSixPointTwoFivePercentTwoThousandAndFortyMember
|
|
|
|
|
Discount Rate Used to Calculate Present Values of Remaining Scheduled Payments of Principal and Interest on Notes to Be Redeemed, Variable Rate Basis |
|
|
treasury rate
|
|
|
|
|
Discount Rate Used to Calculate Present Values of Remaining Scheduled Payments of Principal and Interest on Notes to Be Redeemed, Spread on Rate Basis |
0.40%clf_DiscountRateUsedToCalculatePresentValuesOfRemainingScheduledPaymentsOfPrincipalAndInterestOnNotesToBeRedeemedSpreadOnRateBasis / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionSixPointTwoFivePercentTwoThousandAndFortyMember
|
|
0.40%clf_DiscountRateUsedToCalculatePresentValuesOfRemainingScheduledPaymentsOfPrincipalAndInterestOnNotesToBeRedeemedSpreadOnRateBasis / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionSixPointTwoFivePercentTwoThousandAndFortyMember
|
|
|
|
|
|
|