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Retirement Benefits - Plan Asssets (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
US Plans [Member]
     
Fair Value Of Retirement Plan Investments [Line Items]      
Fair Value of Plan Assets $ 685.4 $ 698.4 $ 658.2
Actual Allocation Total 100.00% 100.00%  
Target Allocation Total 100.00% 100.00%  
US Plans [Member] | Cash, cash equivalents and receivables Member
     
Fair Value Of Retirement Plan Investments [Line Items]      
Fair Value of Plan Assets 3.5 0.1  
US Plans [Member] | U.S. large-cap [Member]
     
Fair Value Of Retirement Plan Investments [Line Items]      
Fair Value of Plan Assets 209.9 210.7  
Equity Securities - Actual Allocation 31.00% 30.00%  
Equity Securities - Target Allocation 30.00% 30.00%  
US Plans [Member] | U.S. small/mid-cap [Member]
     
Fair Value Of Retirement Plan Investments [Line Items]      
Fair Value of Plan Assets 55.2 62.2  
Equity Securities - Actual Allocation 8.00% 9.00%  
Equity Securities - Target Allocation 8.00% 8.00%  
US Plans [Member] | International [Member]
     
Fair Value Of Retirement Plan Investments [Line Items]      
Fair Value of Plan Assets 79.8 85.9  
Equity Securities - Actual Allocation 12.00% 12.00%  
Equity Securities - Target Allocation 12.00% 12.00%  
US Plans [Member] | Emerging markets [Member]
     
Fair Value Of Retirement Plan Investments [Line Items]      
Fair Value of Plan Assets   27.8  
US Plans [Member] | Core fixed income [Member]
     
Fair Value Of Retirement Plan Investments [Line Items]      
Fair Value of Plan Assets 158.0 156.4  
Fixed-income Securities - Actual Allocation 23.00% 23.00%  
Fixed-income Securities - Target Allocation 23.00% 23.00%  
US Plans [Member] | High yield [Member]
     
Fair Value Of Retirement Plan Investments [Line Items]      
Fair Value of Plan Assets 55.2 57.2  
Fixed-income Securities - Actual Allocation 8.00% 8.00%  
Fixed-income Securities - Target Allocation 8.00% 8.00%  
US Plans [Member] | Emerging markets [Member]
     
Fair Value Of Retirement Plan Investments [Line Items]      
Fair Value of Plan Assets 27.0    
Fixed-income Securities - Actual Allocation 4.00% 4.00%  
Fixed-income Securities - Target Allocation 4.00% 4.00%  
US Plans [Member] | Hedge fund of funds [Member]
     
Fair Value Of Retirement Plan Investments [Line Items]      
Fair Value of Plan Assets 96.8 98.1  
Other Types of Investments - Actual Allocation 14.00% 14.00%  
Other Types of Investments - Target Allocation 15.00% 15.00%  
Non-US Plans [Member]
     
Fair Value Of Retirement Plan Investments [Line Items]      
Fair Value of Plan Assets 230.5 218.6 188.9
Actual Allocation Total 100.00% 100.00%  
Target Allocation Total 100.00% 100.00%  
Non-US Plans [Member] | Cash, cash equivalents and receivables Member
     
Fair Value Of Retirement Plan Investments [Line Items]      
Fair Value of Plan Assets 1.0 0.3  
Non-US Plans [Member] | Equity Securities [Member]
     
Fair Value Of Retirement Plan Investments [Line Items]      
Fair Value of Plan Assets 86.6 93.3  
Equity Securities - Actual Allocation 38.00% 43.00%  
Equity Securities - Target Allocation 40.00% 48.00%  
Non-US Plans [Member] | U.S. equity funds [Member]
     
Fair Value Of Retirement Plan Investments [Line Items]      
Fair Value of Plan Assets 21.8 28.1  
Non-US Plans [Member] | Canadian equity funds [Member]
     
Fair Value Of Retirement Plan Investments [Line Items]      
Fair Value of Plan Assets 26.5 28.2  
Non-US Plans [Member] | European equity funds [Member]
     
Fair Value Of Retirement Plan Investments [Line Items]      
Fair Value of Plan Assets 5.3 16.6  
Non-US Plans [Member] | Asia-pacific equity funds [Member]
     
Fair Value Of Retirement Plan Investments [Line Items]      
Fair Value of Plan Assets 1.1 3.0  
Non-US Plans [Member] | Emerging markets [Member]
     
Fair Value Of Retirement Plan Investments [Line Items]      
Fair Value of Plan Assets 3.2 5.7  
Non-US Plans [Member] | Other non-U.S. equity funds [Member]
     
Fair Value Of Retirement Plan Investments [Line Items]      
Fair Value of Plan Assets 28.7 11.7  
Non-US Plans [Member] | Fixed-income securities [Member] Member
     
Fair Value Of Retirement Plan Investments [Line Items]      
Fair Value of Plan Assets 132.0 111.1  
Fixed-income Securities - Actual Allocation 57.00% 52.00%  
Fixed-income Securities - Target Allocation 55.00% 52.00%  
Non-US Plans [Member] | High yield [Member]
     
Fair Value Of Retirement Plan Investments [Line Items]      
Fair Value of Plan Assets 9.9 8.2  
Non-US Plans [Member] | Emerging markets [Member]
     
Fair Value Of Retirement Plan Investments [Line Items]      
Fair Value of Plan Assets 5.5 4.5  
Non-US Plans [Member] | Global credit [Member]
     
Fair Value Of Retirement Plan Investments [Line Items]      
Fair Value of Plan Assets 28.9 23.7  
Non-US Plans [Member] | Canadian fixed-income funds [Member]
     
Fair Value Of Retirement Plan Investments [Line Items]      
Fair Value of Plan Assets 17.9 17.5  
Non-US Plans [Member] | European fixed-income funds [Member]
     
Fair Value Of Retirement Plan Investments [Line Items]      
Fair Value of Plan Assets 5.9 3.7  
Non-US Plans [Member] | Long-duration [Member]
     
Fair Value Of Retirement Plan Investments [Line Items]      
Fair Value of Plan Assets 63.9 53.5  
Non-US Plans [Member] | Other types of investments [Member]
     
Fair Value Of Retirement Plan Investments [Line Items]      
Fair Value of Plan Assets 10.9 13.9  
Other Types of Investments - Actual Allocation 5.00% 5.00%  
Other Types of Investments - Target Allocation 5.00% 0.00%  
Non-US Plans [Member] | Convertible securities [Member] Member
     
Fair Value Of Retirement Plan Investments [Line Items]      
Fair Value of Plan Assets 7.3 7.4  
Non-US Plans [Member] | Other [Member]
     
Fair Value Of Retirement Plan Investments [Line Items]      
Fair Value of Plan Assets 3.6 6.5  
Umwa Plans Postretirement Medical [Member]
     
Fair Value Of Retirement Plan Investments [Line Items]      
Fair Value of Plan Assets 268.0 310.2 308.0
Actual Allocation Total 100.00% 100.00%  
Target Allocation Total 100.00% 100.00%  
Umwa Plans Postretirement Medical [Member] | U.S. large-cap [Member]
     
Fair Value Of Retirement Plan Investments [Line Items]      
Fair Value of Plan Assets 101.8 117.0  
Equity Securities - Actual Allocation 38.00% 38.00%  
Equity Securities - Target Allocation 37.00% 37.00%  
Umwa Plans Postretirement Medical [Member] | U.S. small/mid-cap [Member]
     
Fair Value Of Retirement Plan Investments [Line Items]      
Fair Value of Plan Assets 23.5 28.4  
Equity Securities - Actual Allocation 9.00% 9.00%  
Equity Securities - Target Allocation 9.00% 9.00%  
Umwa Plans Postretirement Medical [Member] | International [Member]
     
Fair Value Of Retirement Plan Investments [Line Items]      
Fair Value of Plan Assets 33.5 44.7  
Equity Securities - Actual Allocation 13.00% 15.00%  
Equity Securities - Target Allocation 14.00% 14.00%  
Umwa Plans Postretirement Medical [Member] | Core fixed income [Member]
     
Fair Value Of Retirement Plan Investments [Line Items]      
Fair Value of Plan Assets 0 41.4  
Fixed-income Securities - Actual Allocation 0.00% 13.00%  
Fixed-income Securities - Target Allocation 0.00% 13.00%  
Umwa Plans Postretirement Medical [Member] | High yield [Member]
     
Fair Value Of Retirement Plan Investments [Line Items]      
Fair Value of Plan Assets 22.6 25.6  
Fixed-income Securities - Actual Allocation 8.00% 8.00%  
Fixed-income Securities - Target Allocation 8.00% 8.00%  
Umwa Plans Postretirement Medical [Member] | Emerging markets [Member]
     
Fair Value Of Retirement Plan Investments [Line Items]      
Fair Value of Plan Assets 11.2 12.7  
Fixed-income Securities - Actual Allocation 4.00% 4.00%  
Fixed-income Securities - Target Allocation 4.00% 4.00%  
Umwa Plans Postretirement Medical [Member] | Multi Asset Real Return [Member]
     
Fair Value Of Retirement Plan Investments [Line Items]      
Fair Value of Plan Assets 35.5 0  
Fixed-income Securities - Actual Allocation 13.00% 0.00%  
Fixed-income Securities - Target Allocation 13.00% 0.00%  
Umwa Plans Postretirement Medical [Member] | Hedge fund of funds [Member]
     
Fair Value Of Retirement Plan Investments [Line Items]      
Fair Value of Plan Assets 39.9 40.4  
Other Types of Investments - Actual Allocation 15.00% 13.00%  
Other Types of Investments - Target Allocation 15.00% 15.00%  
Black Lung And Other Plans Postretirement [Member]
     
Fair Value Of Retirement Plan Investments [Line Items]      
Fair Value of Plan Assets 0 0 0
Pension plan [Member]
     
Fair Value Of Retirement Plan Investments [Line Items]      
Fair Value of Plan Assets 915.9 917.0 847.1
Retirement benefits other than pension [Member]
     
Fair Value Of Retirement Plan Investments [Line Items]      
Fair Value of Plan Assets $ 268.0 $ 310.2 $ 308.0