Acquisitions And Other Investments (Narrative) (Details) In Millions, except Per Share data, unless otherwise specified |
0 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 0 Months Ended | 3 Months Ended | 9 Months Ended | |||||||||||||||||||||||||||||||||||
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Jul. 06, 2010 |
Sep. 30, 2011
USD ($)
MT
|
Sep. 30, 2010
USD ($)
|
Sep. 30, 2011
USD ($)
MT
|
Sep. 30, 2010
USD ($)
|
Dec. 31, 2010
USD ($)
|
Dec. 31, 2009 |
Mar. 31, 2010
Upper Limit [Member]
Wabush [Member]
T
|
Jun. 30, 2010
CLCC [Member]
Lower Limit [Member]
Metallurgical Coal [Member]
T
|
Mar. 31, 2010
Lower Limit [Member]
Wabush [Member]
T
|
Dec. 31, 2010
CLCC [Member]
North American Coal [Member]
USD ($)
|
Sep. 30, 2011
Consolidated Thompson [Member]
Eastern Canadian Iron Ore [Member]
USD ($)
|
Sep. 30, 2011
WISCO [Member]
|
Dec. 31, 2010
CLCC [Member]
Construction Permits [Member]
USD ($)
|
Dec. 31, 2010
CLCC [Member]
Lease Agreements [Member]
USD ($)
|
Dec. 31, 2010
CLCC [Member]
Scenario, Adjustment [Member]
USD ($)
|
Sep. 30, 2011
Consolidated Thompson [Member]
Scenario, Adjustment [Member]
USD ($)
|
Sep. 30, 2010
Scenario, Adjustment [Member]
Wabush [Member]
USD ($)
|
Dec. 31, 2010
Scenario, Adjustment [Member]
Wabush [Member]
USD ($)
|
Dec. 31, 2010
CLCC [Member]
Scenario, Change [Member]
USD ($)
|
Sep. 30, 2011
Consolidated Thompson [Member]
Scenario, Change [Member]
USD ($)
|
Mar. 31, 2010
CLCC [Member]
Scenario, Previously Reported [Member]
USD ($)
|
Sep. 30, 2011
Consolidated Thompson [Member]
Scenario, Previously Reported [Member]
USD ($)
|
Jul. 06, 2010
Scenario, Previously Reported [Member]
|
Mar. 31, 2010
Scenario, Previously Reported [Member]
Freewest [Member]
USD ($)
|
Mar. 31, 2010
Scenario, Previously Reported [Member]
Wabush [Member]
USD ($)
|
Sep. 30, 2011
Scenario, Previously Reported [Member]
Spider [Member]
|
Dec. 31, 2009
Scenario, Previously Reported [Member]
Spider [Member]
USD ($)
|
Mar. 31, 2011
CLCC [Member]
|
Sep. 30, 2010
CLCC [Member]
|
Dec. 31, 2010
CLCC [Member]
USD ($)
|
Jun. 30, 2010
CLCC [Member]
Metallurgical Coal [Member]
T
|
Jun. 30, 2010
CLCC [Member]
Thermal Coal [Member]
T
|
Mar. 31, 2010
Freewest [Member]
USD ($)
T
|
Jan. 27, 2011
Freewest [Member]
|
Mar. 31, 2010
Freewest [Member]
CAD
|
Dec. 31, 2009
Freewest [Member]
USD ($)
|
Mar. 31, 2010
Wabush [Member]
T
|
Feb. 01, 2010
Wabush [Member]
|
Jan. 11, 2011
Consolidated Thompson [Member]
CAD
|
Sep. 30, 2011
Consolidated Thompson [Member]
USD ($)
|
Sep. 30, 2011
Consolidated Thompson [Member]
USD ($)
|
May 12, 2011
Consolidated Thompson [Member]
CAD
|
Dec. 31, 2010
Spider [Member]
USD ($)
|
Jul. 26, 2010
Spider [Member]
|
Jul. 06, 2010
Spider [Member]
USD ($)
|
Jun. 30, 2010
Spider [Member]
USD ($)
|
Mar. 31, 2010
Spider [Member]
|
|
| Percent ownership interest | 4.00% | 100.00% | 85.00% | 52.00% | 26.50% | |||||||||||||||||||||||||||||||||||||||||||
| Aggregate acquisition consideration | $ 775.9 | $ 4,554.0 | $ 103.0 | $ 1.4 | $ 774.5 | $ 4,554.0 | $ 775.9 | $ 4,600.0 | $ 4,600.0 | |||||||||||||||||||||||||||||||||||||||
| Cash portion of acquisition consideration | 757.0 | 4,554.0 | 88.0 | 757.0 | 4,554.0 | 12.8 | 757.0 | |||||||||||||||||||||||||||||||||||||||||
| Working capital adjustment as part of acquisition consideration | 18.9 | 15.0 | 1.4 | 17.5 | 18.9 | |||||||||||||||||||||||||||||||||||||||||||
| Production capacity and reserve effects and rationale for acquisition |
CLCC is a producer of high-volatile metallurgical and thermal coal located in southern West Virginia. CLCC's operations include two underground continuous mining method metallurgical coal mines and one open surface thermal coal mine. The acquisition includes a metallurgical and thermal coal mining complex with a coal preparation and processing facility as well as a large, long-life reserve base with an estimated 59 million tons of metallurgical coal and 62 million tons of thermal coal. This reserve base increases our total global reserve base to over 166 million tons of metallurgical coal and over 67 million tons of thermal coal. This acquisition represents an opportunity for us to add complementary high-quality coal products and provides certain advantages, including among other things, long-life mine assets, operational flexibility, and new equipment. |
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| Ownership interest before acquisition | 12.40% | 26.80% | ||||||||||||||||||||||||||||||||||||||||||||||
| Fair value of equity interest before acquisition | 38.0 | 39.7 | 4.9 | 27.4 | 51.9 | |||||||||||||||||||||||||||||||||||||||||||
| Gain on remeasurement of equity interest before acquisition | 2.1 | 40.7 | 25.0 | 47.0 | 13.6 | |||||||||||||||||||||||||||||||||||||||||||
| Gain on remeasurement of equity interest before acquisition recorded in Accumulated other comprehensive income (loss) | 20.3 | |||||||||||||||||||||||||||||||||||||||||||||||
| Acquired intangible assets | 5.4 | 2.1 | 7.5 | 2.1 | 7.5 | 2.1 | 7.5 | |||||||||||||||||||||||||||||||||||||||||
| Acquisition related costs | 2.1 | 25.0 | 2.1 | 25.0 | ||||||||||||||||||||||||||||||||||||||||||||
| Deferred debt issuance costs | 16.3 | 16.3 | ||||||||||||||||||||||||||||||||||||||||||||||
| Interest expense | 49.6 | 17.4 | 169.2 | 41.0 | 38.3 | |||||||||||||||||||||||||||||||||||||||||||
| Accumulated amortization of deferred debt issuance costs | 0.7 | 0.7 | ||||||||||||||||||||||||||||||||||||||||||||||
| Other current assets | 144.0 | 144.0 | 114.8 | 1.7 | 1.7 | |||||||||||||||||||||||||||||||||||||||||||
| Other non-current assets | 222.5 | 222.5 | 187.9 | 14.6 | 14.6 | |||||||||||||||||||||||||||||||||||||||||||
| Goodwill | 27.8 | 1,000.0 | 27.8 | 1,045.8 | 3.1 | 19.0 | 24.7 | 1,026.8 | 75.2 | |||||||||||||||||||||||||||||||||||||||
| Goodwill tax deductibility | None of the goodwill is expected to be deductible for income tax purposes. | |||||||||||||||||||||||||||||||||||||||||||||||
| Number of shares acquired through business combination | 29 | |||||||||||||||||||||||||||||||||||||||||||||||
| Percentage of shares acquired | 100.00% | 100.00% | 100.00% | 100.00% | ||||||||||||||||||||||||||||||||||||||||||||
| Cost per share acquired | 1.00 | 17.25 | $ 0.19 | |||||||||||||||||||||||||||||||||||||||||||||
| Noncontrolling interest percentage of ownership spider | 48.00% | |||||||||||||||||||||||||||||||||||||||||||||||
| Noncontrolling interest on acquisition date | 290.5 | |||||||||||||||||||||||||||||||||||||||||||||||
| Common stock exchanged per share acquired | $ 0.0201 | |||||||||||||||||||||||||||||||||||||||||||||||
| Fair value of equity portion of acquisition consideration | 173.1 | |||||||||||||||||||||||||||||||||||||||||||||||
| Number of shares issued as acquisition consideration | 4.2 | 27.4 | ||||||||||||||||||||||||||||||||||||||||||||||
| Acquisition price, value of iron ore pellets | 18.9 | 15.0 | 1.4 | 17.5 | 18.9 | |||||||||||||||||||||||||||||||||||||||||||
| Total consideration transferred including interest held prior to acquisition | 1.7 | (775.9) | (4,554.0) | (1.4) | (774.5) | (4,554.0) | (185.9) | (56.9) | ||||||||||||||||||||||||||||||||||||||||
| Tons of rated capacity | 5,500,000 | |||||||||||||||||||||||||||||||||||||||||||||||
| Increase in tons of rated capacity | 50,000,000 | 4,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||
| Estimated coal reserve base | 59,000,000 | 62,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||
| Increase in coal reserve base | 166,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||
| Ring of Fire properties, expected annual tons of high-grade chromite ore | 1,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||
| Ring of Fire properties, expected annual tons of ferrochrome processed | 600,000 | |||||||||||||||||||||||||||||||||||||||||||||||
| Business acquisition cost of acquired entity purchase price per share | 17.25 | |||||||||||||||||||||||||||||||||||||||||||||||
| Interest Percentage | 25.00% | |||||||||||||||||||||||||||||||||||||||||||||||
| Gross post-project production capacity, tons | 8,000,000 | 8,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||
| Incremental revenue | 285.2 | 431.0 | ||||||||||||||||||||||||||||||||||||||||||||||
| Operating loss | (167.8) | (160.6) | ||||||||||||||||||||||||||||||||||||||||||||||
| Amount excluded from pro forma net income | 2.1 | 69.2 | ||||||||||||||||||||||||||||||||||||||||||||||
| Nonrecurring inventory purchase accounting adjustment | $ 11.2 | $ 59.8 | ||||||||||||||||||||||||||||||||||||||||||||||