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Derivatives - Effect on Income (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Gain (loss) on derivative
Gains or losses that were excluded from the assessment of the effectiveness of fair value hedges				$ 0.0	$ 0.0
Commodity contracts
Derivative, credit-risk related contingent features
Net liability position		$ 16.0		16.0		$ 63.2
Collateral posted		(4.4)		(4.4)		(28.1)
Contingent additional collateral		11.6		11.6		$ 35.0
Cash flow hedges.
Gain (loss) on derivative
Amount of Loss Recognized in Accumulated Other Comprehensive Income (Effective Portion)		(1.3)		(3.6)
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Effective Portion)		6.5		7.1
Amount of Loss Recognized in Income (Ineffective Portion)		(5.1)		(2.3)
Cash flow hedges. | Commodity contracts | Revenue
Gain (loss) on derivative
Amount of Loss Recognized in Accumulated Other Comprehensive Income (Effective Portion)		(70.0)		(116.5)
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Effective Portion)		5.4		(48.4)
Amount of Loss Recognized in Income (Ineffective Portion)		(15.0)		(15.1)
Cash flow hedges. | Commodity contracts | Cost of revenue.
Gain (loss) on derivative
Amount of Gain Recognized in Accumulated Other Comprehensive Income (Effective Portion)		68.7		112.9
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Effective Portion)		1.1		55.5
Amount of Gain Recognized in Income (Ineffective Portion)		9.9		12.8
Derivatives designated as hedging instruments | Fair value hedges | Commodity contracts | Cost of revenue.
Gain (loss) on derivative
Realized and Unrealized Gain (Loss) on Hedge	[1]	(34.2)	$ (20.1)	(30.8)	(16.1)
Realized and Unrealized Gain (Loss) on Hedged Item	[1]	13.9	19.8	10.7	19.3
Derivatives not designated as hedging instruments
Gain (loss) on derivative
Realized and Unrealized Gain (Loss)	[1]	7.4	(0.4)	(4.4)	21.6
Derivatives not designated as hedging instruments | Commodity contracts | Revenue
Gain (loss) on derivative
Realized and Unrealized Gain (Loss)	[1]	(5.5)	25.4	33.4	46.0
Derivatives not designated as hedging instruments | Commodity contracts | Cost of revenue.
Gain (loss) on derivative
Realized and Unrealized Gain (Loss)	[1]	8.8	(16.4)	(38.7)	(28.1)
Derivatives not designated as hedging instruments | Foreign currency contracts | Revenue
Gain (loss) on derivative
Realized and Unrealized Gain (Loss)	[1]	4.5	(5.2)	6.5	(1.3)
Derivatives not designated as hedging instruments | Foreign currency contracts | Other (expense) income, net
Gain (loss) on derivative
Realized and Unrealized Gain (Loss)	[1]	$ (0.4)	$ (4.2)	$ (5.6)	$ 5.0
[1] Amounts may not add due to rounding

X

- Definition

The aggregate fair value of additional assets that would be required to be posted as collateral for derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period.

+ References

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-Publisher FASB
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Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement.

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Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement.

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The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features.

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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The portion of gains on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

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The effective portion of gains on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

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The portion of losses on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

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The effective portion of losses on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

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The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument.

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Net gain (loss) relating to components of the gain (loss) on the fair value hedging instrument excluded from the assessment of fair value hedge effectiveness. Recognized in earnings.

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