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Fair Value Measurements - Level 3 Inputs (Details) - Commodity contracts - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Revenue |  |
Change in fair value of assets and liabilities measured on recurring basis, utilized Level 3 inputs |  |
Beginning of Period | $ 4.2 |
Total Gains (Losses) Included in Earnings | 3.4 | $ 12.7
Settlements | 5.3 | 8.9
Transfers into Level 3 | 1.0 | 0.4
End of Period | 3.3 | 4.2
Change in Unrealized Gains Relating to Assets (Liabilities) that are Held at end of Period | 2.8 | 4.2
Cost of revenue. |  |
Change in fair value of assets and liabilities measured on recurring basis, utilized Level 3 inputs |  |
Beginning of Period | 1.3 |
Total Gains (Losses) Included in Earnings | 0.6 | (1.4)
Settlements | 0.5 | 0.1
Transfers into Level 3 | (0.1) |
End of Period | 0.3 | 1.3
Change in Unrealized Gains Relating to Assets (Liabilities) that are Held at end of Period | $ 0.2 | $ (1.3)

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