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Fair Value Measurements - Level 3 Inputs (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Change in fair value of assets and liabilities measured on recurring basis, utilized Level 3 inputs    
Transfer of assets from Level 1 to Level 2 $ 0.0 $ 0.0
Transfer of assets from Level 2 to Level 1 0.0 0.0
Transfer of liabilities from Level 1 to Level 2 0.0 0.0
Transfer of liabilities from Level 2 to Level 1 0.0 0.0
Commodity contracts | Revenue    
Change in fair value of assets and liabilities measured on recurring basis, utilized Level 3 inputs    
Beginning of Period [1] 2.8 4.2
Total Gains (Losses) Included in Earnings [1] 0.2 0.8
Settlements [1] 1.4 3.7
Transfers into Level 3 [1] 1.3  
End of Period [1] 3.0 1.3
Change in Unrealized Gains Relating to Assets (Liabilities) that are Held at end of Period [1] 1.3 (0.4)
Commodity contracts | Cost of revenue.    
Change in fair value of assets and liabilities measured on recurring basis, utilized Level 3 inputs    
Beginning of Period [1] 0.2 1.3
Total Gains (Losses) Included in Earnings [1] 0.1 0.5
Settlements [1]   0.5
End of Period [1] $ 0.3 0.3
Change in Unrealized Gains Relating to Assets (Liabilities) that are Held at end of Period [1]   $ 0.8
[1] Amounts may not add due to rounding