Derivatives and Fair Value Measurements (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in other comprehensive income on derivative (effective portion)	$ 67.5	$ 218.8	$ (405.5)	$ 326.2
Gain reclassified from other comprehensive income into income (effective portion)	14.2	93.2	168.6	315.6
Gain (loss) reclassified from other comprehensive income into income (ineffective portion)	0.2	2.2	0.5	(2.3)
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]
Gain (loss) recognized in other comprehensive income on derivative (effective portion)	51.7	169.2	(402.2)	297.5
Gain reclassified from other comprehensive income into income (effective portion)	9.9	82.0	157.1	276.6
Gain (loss) reclassified from other comprehensive income into income (ineffective portion)	0	0	0	0
Foreign Currency Forward Contract [Member] | Operating costs and expenses [Member] | Cash flow hedges [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]
Gain (loss) recognized in other comprehensive income on derivative (effective portion)	15.8	49.6	(3.3)	28.7
Gain reclassified from other comprehensive income into income (effective portion)	4.3	11.2	11.5	39.0
Gain (loss) reclassified from other comprehensive income into income (ineffective portion)	0.2	2.2	0.5	(2.3)
Commodity swap contracts [Member] | Operating costs and expenses [Member] | Cash flow hedges [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