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Financial Instruments and Risk Management (Details 2) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Fair Value Measurements    
Total current derivative contracts, assets $ 23.6 $ 9.4
Long-term derivative assets 2.5 3.1
Total current derivative contracts, liabilities 57.1 12.3
Total noncurrent derivative contracts, liabilities $ 18.9 7.6
Discount factor 12 month LIBOR  
Commodity contracts    
Fair Value Measurements    
Total current derivative contracts, assets $ 10.4 5.1
Long-term derivative assets 1.0 2.7
Total current derivative contracts, liabilities 20.5 8.5
Total noncurrent derivative contracts, liabilities 9.3 7.3
Foreign currency contracts    
Fair Value Measurements    
Total current derivative contracts, assets 13.2 4.3
Total current derivative contracts, liabilities 31.4 2.9
Interest rate and other contracts    
Fair Value Measurements    
Long-term derivative assets 1.5 0.4
Total current derivative contracts, liabilities 5.2 0.9
Total noncurrent derivative contracts, liabilities 9.6 0.3
Derivatives Designated As Hedging Instruments    
Fair Value Measurements    
Total current derivative contracts, assets 5.8 4.6
Long-term derivative assets 0.2 2.6
Total current derivative contracts, liabilities 16.7 9.0
Total noncurrent derivative contracts, liabilities 8.2 7.1
Derivatives Designated As Hedging Instruments | Commodity contracts    
Fair Value Measurements    
Total current derivative contracts, assets 5.7 3.8
Long-term derivative assets 0.2 2.2
Total current derivative contracts, liabilities 14.0 6.9
Total noncurrent derivative contracts, liabilities 7.8 6.8
Derivatives Designated As Hedging Instruments | Foreign currency contracts    
Fair Value Measurements    
Total current derivative contracts, assets 0.1 0.8
Total current derivative contracts, liabilities 2.2 1.6
Derivatives Designated As Hedging Instruments | Interest rate and other contracts    
Fair Value Measurements    
Long-term derivative assets   0.4
Total current derivative contracts, liabilities 0.5 0.5
Total noncurrent derivative contracts, liabilities 0.4 0.3
Derivatives Not Designated As Hedging Instruments    
Fair Value Measurements    
Total current derivative contracts, assets 17.8 4.8
Long-term derivative assets 2.3 0.5
Total current derivative contracts, liabilities 40.4 3.3
Total noncurrent derivative contracts, liabilities 10.7 0.5
Derivatives Not Designated As Hedging Instruments | Commodity contracts    
Fair Value Measurements    
Total current derivative contracts, assets 4.7 1.3
Long-term derivative assets 0.8 0.5
Total current derivative contracts, liabilities 6.5 1.6
Total noncurrent derivative contracts, liabilities 1.5 0.5
Derivatives Not Designated As Hedging Instruments | Foreign currency contracts    
Fair Value Measurements    
Total current derivative contracts, assets 13.1 3.5
Total current derivative contracts, liabilities 29.2 1.3
Derivatives Not Designated As Hedging Instruments | Interest rate and other contracts    
Fair Value Measurements    
Long-term derivative assets 1.5  
Total current derivative contracts, liabilities 4.7 $ 0.4
Total noncurrent derivative contracts, liabilities $ 9.2