Cleveland-Cliffs Inc. Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

PENSIONS AND OTHER POSTRETIREMENT BENEFITS (Components Of Net Periodic Benefit Cost) (Details)

PENSIONS AND OTHER POSTRETIREMENT BENEFITS (Components Of Net Periodic Benefit Cost) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	$ 205.8	$ 188.6	$ 200.5
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Actuarial Gain (Loss)	14.1	29.9	30.4
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments	2.9	0	0
Defined Benefit Plan, Cost of Providing Special or Contractual Termination Benefits Recognized During Period	3.4	0	0
Defined Benefit Plan, Fair Value of Plan Assets	949.6	915.3	838.7
Service cost	30.8	38.9	32.0
Interest cost	49.7	45.9	48.4
Expected return on plan assets	(72.3)	(65.6)	(59.5)
Amortization:
Net asset	0	0	0
Prior service costs (credits)	2.7	3.0	3.9
Net actuarial loss	15.5	29.9	30.4
Net periodic benefit cost	31.3	52.1	55.2
Effect of Curtailment	0	0	0
Current year actuarial (gain)/loss	121.8	(168.8)	53.1
Amortization of net loss	15.5	29.9	30.4
Current year prior service cost	(1.5)	0.8	2.8
Amortization of prior service (cost) credit	(2.7)	(3.0)	(3.9)
Amortization of transition asset	0	0	0
Total recognized in other comprehensive income	102.1	(200.9)	21.6
Total recognized in net periodic cost and other comprehensive income	133.4	(148.8)	76.8
Defined Benefit Plan, Benefit Obligation	(1,227.4)	(1,118.0)	(1,244.3)
Defined Benefit Plan, Funded Status of Plan	(277.8)	(202.7)
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Actuarial Gain (Loss)	5.0	11.5	11.6
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments	(7.9)	0	0
Defined Benefit Plan, Cost of Providing Special or Contractual Termination Benefits Recognized During Period	0	0	0
Defined Benefit Plan, Fair Value of Plan Assets	269.3	251.8	237.0
Service cost	6.7	12.3	14.7
Interest cost	16.2	17.3	20.6
Expected return on plan assets	(17.1)	(20.1)	(17.7)
Amortization:
Net asset	0	0	(3.0)
Prior service costs (credits)	(3.6)	(3.6)	1.9
Net actuarial loss	5.0	11.5	11.6
Net periodic benefit cost	(0.7)	17.4	28.1
Effect of Curtailment	(0.8)	0	0
Current year actuarial (gain)/loss	36.9	(95.2)	3.2
Amortization of net loss	5.0	11.5	11.6
Current year prior service cost	(0.9)	0	(58.3)
Amortization of prior service (cost) credit	3.6	3.6	(1.9)
Amortization of transition asset	0	0	3.0
Total recognized in other comprehensive income	33.8	(103.1)	(65.6)
Total recognized in net periodic cost and other comprehensive income	33.1	(85.7)	(37.5)
Defined Benefit Plan, Benefit Obligation	(395.9)	(356.2)	(459.8)
Defined Benefit Plan, Funded Status of Plan	(126.6)	(104.4)
Salaried Employees [Member] \| Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	366.4	357.4
Amortization:
Defined Benefit Plan, Benefit Obligation	(471.4)	(427.2)
Defined Benefit Plan, Funded Status of Plan	(105.0)	(69.8)
Salaried Employees [Member] \| Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	0
Amortization:
Defined Benefit Plan, Benefit Obligation	(54.0)	(53.6)
Defined Benefit Plan, Funded Status of Plan	(54.0)	(53.6)
Hourly Employees [Member] \| Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	576.6	552.7
Amortization:
Defined Benefit Plan, Benefit Obligation	(739.2)	(674.8)
Defined Benefit Plan, Funded Status of Plan	(162.6)	(122.1)
Hourly Employees [Member] \| Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	269.3	251.8
Amortization:
Defined Benefit Plan, Benefit Obligation	(341.9)	(302.6)
Defined Benefit Plan, Funded Status of Plan	(72.6)	(50.8)
Mining Employees [Member] \| Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	6.6	5.2
Amortization:
Defined Benefit Plan, Benefit Obligation	(9.2)	(6.8)
Defined Benefit Plan, Funded Status of Plan	(2.6)	(1.6)
Supplemental Executive Retirement Plan S E R P [Member] \| Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	0
Amortization:
Defined Benefit Plan, Benefit Obligation	(7.6)	(9.2)
Defined Benefit Plan, Funded Status of Plan	$ (7.6)	$ (9.2)