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Fair Value Measurements (Details 3) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
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	0.5	$ 5.8	4.2
Total Gains (Losses) Included in Earnings	(0.1)	4.1	0.7	$ 9.9
Total Gains (Losses) Included in Earnings		(0.1)		(0.1)
Settlements	0.1	6.6	4.6	6.6
Transfers into Level 3	1.0		1.0
End of Period	1.3	3.3	1.3	3.3
End of Period		0.1		0.1
Change in Unrealized Gains Relating to Assets (Liabilities) that are Held at end of Period	1.0	$ 2.0	1.4	$ 3.3
Commodity contracts | Cost of revenue.
Change in fair value of assets and liabilities measured on recurring basis, utilized Level 3 inputs
Beginning of Period	0.4		1.3
Total Gains (Losses) Included in Earnings	0.4		0.8
Settlements			0.5
Transfers into Level 3	(0.1)		(0.1)
End of Period	0.1		0.1
Change in Unrealized Gains Relating to Assets (Liabilities) that are Held at end of Period	$ 0.5		$ 0.9

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