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Fair Value Measurements (Details 3) - Commodity contracts - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Revenue |  |  |  |
Change in fair value of assets and liabilities measured on recurring basis, utilized Level 3 inputs |  |  |  |
Beginning of Period | $ 1.3 |  | $ 4.2 |
Total Gains (Losses) Included in Earnings |  | $ 5.8 | 0.8 | $ 5.8
Settlements | 0.8 |  | 4.5 |
End of Period | 0.5 | 5.8 | 0.5 | 5.8
Change in Unrealized Gains Relating to Assets (Liabilities) that are Held at end of Period | 0.4 | $ 5.8 |  | $ 5.8
Cost of revenue. |  |  |  |
Change in fair value of assets and liabilities measured on recurring basis, utilized Level 3 inputs |  |  |  |
Beginning of Period | 0.3 |  | 1.3 |
Total Gains (Losses) Included in Earnings | (0.1) |  | 0.4 |
Settlements |  |  | 0.5 |
End of Period | 0.4 |  | 0.4 |
Change in Unrealized Gains Relating to Assets (Liabilities) that are Held at end of Period | $ (0.1) |  | $ 0.7 |

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