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Fair Value Measurements - Level 3 Inputs (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 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 $ 0.0 $ 0.0
Transfer of assets from Level 2 to Level 1 0.0 0.0 0.0 0.0
Transfer of liabilities from Level 1 to Level 2 0.0 0.0 0.0 0.0
Transfer of liabilities from Level 2 to Level 1 0.0 0.0 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] 3.0 1.3 3.3 4.2
Total Gains (Losses) Included in Earnings [1] (2.1)   (2.3) 0.8
Settlements [1] 0.5 0.8 1.8 4.5
Transfers into Level 3 [1]     1.3  
End of Period [1] 0.4 0.5 0.4 0.5
Change in Unrealized Gains Relating to Assets (Liabilities) that are Held at end of Period [1] (1.7) 0.4 (2.3)  
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] 0.3 0.3 0.2 1.3
Total Gains (Losses) Included in Earnings [1]   (0.1) (0.1) 0.4
Settlements [1] 0.1     0.5
End of Period [1] 0.2 0.4 $ 0.2 0.4
Change in Unrealized Gains Relating to Assets (Liabilities) that are Held at end of Period [1] $ 0.3 $ (0.1)   $ 0.7
[1] Amounts may not add due to rounding