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Fair Value Measurements - Commodity and Foregin Currency Contracts (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Fair value measurement, additional disclosure    
Cash collateral deposits held by financial counterparties $ 174.6 $ 301.0
Cash collateral deposits held by financial counterparties, offset against liabilities 132.2 274.3
Cash collateral deposits held by financial counterparties, not offset 42.4 26.7
Cash collateral received from customers 21.6 46.7
Commodity contracts    
Derivative instruments, at their respective fair value positions    
Total net assets 231.5 305.5
Total net liabilities 74.1 42.0
Commodity contracts | Short-term derivative assets, net    
Derivative instruments, at their respective fair value positions    
Total net assets 212.6 294.3
Commodity contracts | Identifiable intangible and other non-current assets    
Derivative instruments, at their respective fair value positions    
Total net assets 18.9 11.2
Commodity contracts | Accrued expenses and other current liabilities    
Derivative instruments, at their respective fair value positions    
Total net liabilities 68.7 41.3
Commodity contracts | Other long-term liabilities    
Derivative instruments, at their respective fair value positions    
Total net liabilities 5.4 0.7
Foreign currency contracts    
Derivative instruments, at their respective fair value positions    
Total net assets 8.3 9.8
Total net liabilities 0.9  
Foreign currency contracts | Short-term derivative assets, net    
Derivative instruments, at their respective fair value positions    
Total net assets 7.6 9.3
Foreign currency contracts | Identifiable intangible and other non-current assets    
Derivative instruments, at their respective fair value positions    
Total net assets 0.7 $ 0.5
Foreign currency contracts | Accrued expenses and other current liabilities    
Derivative instruments, at their respective fair value positions    
Total net liabilities $ 0.9