Financial Instruments (Gain And Loss On The Derivative Representing Either Hedge Ineffectiveness Or Hedge Components Excluded From The Assessment Of Effectiveness) (Details) (Cash Flow Hedging [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010
Derivatives, Fair Value [Line Items]
Effective Portion recognized in OCI Gain / (Loss)	$ (22.3)		$ 24.6
Reclassified from Accumulated OCI Gain / (Loss)	14.7		(20.7)
Ineffective portion and amount excluded from effectiveness testing Gain / (Loss)	(1.3)	[1]	0.8	[1]
Interest Expense [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Effective Portion recognized in OCI Gain / (Loss)	(0.5)		(6.8)
Reclassified from Accumulated OCI Gain / (Loss)	(0.2)		(0.4)
Ineffective portion and amount excluded from effectiveness testing Gain / (Loss)	(0.3)	[1]	0.1	[1]
Cost Of Sales [Member] | Commodity Futures [Member]
Derivatives, Fair Value [Line Items]
Effective Portion recognized in OCI Gain / (Loss)	(23.8)		35.1
Reclassified from Accumulated OCI Gain / (Loss)	14.8		(15.0)
Ineffective portion and amount excluded from effectiveness testing Gain / (Loss)	(1.1)	[1]	0	[1]
Other Income /(Expense) [Member] | Foreign Currency Exchanges [Member]
Derivatives, Fair Value [Line Items]
Effective Portion recognized in OCI Gain / (Loss)	2.0		(3.7)
Reclassified from Accumulated OCI Gain / (Loss)	0.1		(5.3)
Ineffective portion and amount excluded from effectiveness testing Gain / (Loss)	$ 0.1	[1]	$ 0.7	[1]

[1] The ineffective portion and the amount excluded from effectiveness testing for all derivatives designated as cash flow hedges is recognized in other income and expense.