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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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