Financial Instruments (Gain and Loss on the Derivative Representing Either Hedge Ineffectiveness or Hedge Components Excluded From the Assessment of Effectiveness) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 29, 2012		Jul. 01, 2011		Jun. 29, 2012		Jul. 01, 2011
Derivatives, Fair Value [Line Items]
Effective Portion recognized in OCI Gain / (Loss)	$ (8.4)		$ (5.4)		$ 0.1		$ (2.9)
Reclassified from Accumulated OCI Gain / (Loss)	(0.9)		4.3		(0.8)		21.2
Ineffective portion and amount excluded from effectiveness testing Gain / (Loss)	(0.2)		0	[1]	(0.4)		(0.1)	[1]
Interest Expense [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Effective Portion recognized in OCI Gain / (Loss)	0.1		0.1		0.3		(0.3)
Reclassified from Accumulated OCI Gain / (Loss)	0		0		0		0
Ineffective portion and amount excluded from effectiveness testing Gain / (Loss)	0	[1]	(0.1)	[1]	0	[1]	(0.2)	[1]
Cost Of Sales [Member] | Commodity Futures [Member]
Derivatives, Fair Value [Line Items]
Effective Portion recognized in OCI Gain / (Loss)	(8.5)		(4.4)		(0.1)		(4.1)
Reclassified from Accumulated OCI Gain / (Loss)	(0.6)		3.6		0.1		20.9
Ineffective portion and amount excluded from effectiveness testing Gain / (Loss)	(0.2)	[1]	(0.1)	[1]	(0.4)	[1]	0	[1]
Other Income /(Expense) [Member] | Foreign Currency Exchanges [Member]
Derivatives, Fair Value [Line Items]
Effective Portion recognized in OCI Gain / (Loss)	0		(1.1)		(0.1)		1.5
Reclassified from Accumulated OCI Gain / (Loss)	(0.3)		0.7		(0.9)		0.3
Ineffective portion and amount excluded from effectiveness testing Gain / (Loss)	$ 0	[1]	$ 0.2	[1]	$ 0	[1]	$ 0.1	[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.