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Acquisitions And Other Investments (Narrative) (Details)
In Millions, except Per Share data, unless otherwise specified
0 Months Ended3 Months Ended9 Months Ended3 Months Ended3 Months Ended12 Months Ended3 Months Ended3 Months Ended9 Months Ended3 Months Ended0 Months Ended3 Months Ended9 Months Ended
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               757.04,554.0 88.0  757.04,554.0 12.8     757.0                 
Working capital adjustment as part of acquisition consideration               18.9  15.01.4 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.

                   
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             5.42.17.52.1    7.52.1       7.5                 
Acquisition related costs 2.1 25.0                                    2.125.0      
Deferred debt issuance costs                                        16.316.3      
Interest expense 49.617.4169.241.0                                    38.3      
Accumulated amortization of deferred debt issuance costs                                        0.70.7      
Other current assets 144.0 144.0 114.8                                  1.71.7      
Other non-current assets 222.5 222.5 187.9                                  14.614.6      
Goodwill          27.81,000.0   27.81,045.8  3.119.024.71,026.8                    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 date290.5                                               
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  15.01.4 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                               59,000,00062,000,000               
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                                        285.2431.0      
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