Derivatives and Fair Value Measurements (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013
Gains realized on previously monetized foreign currency cash flow hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Foreign currency cash flow hedge gains reclassified to earnings	$ 31.9			$ 106.7
Operating costs and expenses [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain recognized in income on non-designated derivatives	0		0	0		0
Operating costs and expenses [Member] | Cash flow hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
(Loss) gain recognized in other comprehensive income on derivatives (effective portion)	(275.0)	[1]	67.5	10.6	[2]	(405.5)
(Loss) gain reclassified from other comprehensive income into income (effective portion)	8.6	[1]	14.2	(6.2)	[2]	168.6
(Loss) gain reclassified from other comprehensive income into income (ineffective portion)	(1.8)		0.2	(1.0)		0.5
Commodity swap contracts [Member] | Operating costs and expenses [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain recognized in income on non-designated derivatives	0		0	0		0
Commodity swap contracts [Member] | Operating costs and expenses [Member] | Cash flow hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
(Loss) gain recognized in other comprehensive income on derivatives (effective portion)	(47.3)		15.8	(38.1)		(3.3)
(Loss) gain reclassified from other comprehensive income into income (effective portion)	(1.0)		4.3	(3.3)		11.5
(Loss) gain reclassified from other comprehensive income into income (ineffective portion)	(1.8)		0.2	(1.0)		0.5
Foreign currency forward contract [Member] | Operating costs and expenses [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain recognized in income on non-designated derivatives	0		0	0		0
Foreign currency forward contract [Member] | Operating costs and expenses [Member] | Cash flow hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
(Loss) gain recognized in other comprehensive income on derivatives (effective portion)	(227.7)	[1]	51.7	48.7	[2]	(402.2)
(Loss) gain reclassified from other comprehensive income into income (effective portion)	9.6	[1]	9.9	(2.9)	[2]	157.1
(Loss) gain reclassified from other comprehensive income into income (ineffective portion)	$ 0		$ 0	$ 0		$ 0

[1] Includes the reclassification from "Accumulated other comprehensive loss" into earnings of $31.9 million of previously unrecognized gains on foreign currency cash flow hedge contracts monetized in the fourth quarter of 2012.

[2] Includes the reclassification from "Accumulated other comprehensive loss" into earnings of $106.7 million of previously unrecognized gains on foreign currency cash flow hedge contracts monetized in the fourth quarter of 2012.