Financial Instruments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended		12 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 28, 2012	Sep. 30, 2011	Dec. 31, 2011	Sep. 28, 2012 Not Designated as Hedging Instrument [Member]	Sep. 30, 2011 Not Designated as Hedging Instrument [Member]	Sep. 28, 2012 Not Designated as Hedging Instrument [Member]	Sep. 30, 2011 Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Number of derivative require collateral security		0		0
Collateral to secure the derivative liability positions				$ 0.7
Gain (loss) on derivative instruments not designated as cash flow hedges	31.5		28.4		8.1	(6.7)	7.8	(0.3)
Expected pre-tax gain on derivatives to be reclassified into earnings in the next twelve months		0.7
Forward pricing agreements		34.3		36.3
Fair value forward pricing agreements		35.7		35.3
Unrealized gain (loss) related to forward pricing agreements		$ 1.4		$ (1.0)