Derivatives (Derivatives Not Designated As Hedging Instruments) (Details) (Not Designated As Hedging Instrument [Member], USD $) In Millions	9 Months Ended
	Sep. 25, 2011	Sep. 26, 2010	Dec. 26, 2010
Notional amount of derivatives not designated as hedging instruments	$ 51.6		$ 20.7
Derivatives not designated as hedging instruments at fair value	0.1		0
Amount of Gain (Loss) Recognized In Income	(1.5)	0.6
Foreign Exchange Contracts [Member] | Revenue [Member]
Amount of Gain (Loss) Recognized In Income	(0.2)	(0.1)
Foreign Exchange Contracts [Member] | Expenses [Member]
Amount of Gain (Loss) Recognized In Income	(1.3)	0.7
Foreign Exchange Contracts [Member] | Current Assets [Member]
Notional amount of derivatives not designated as hedging instruments	6.7
Foreign Exchange Contracts [Member] | Current Liabilities [Member]
Notional amount of derivatives not designated as hedging instruments	44.9		20.7
Derivatives not designated as hedging instruments at fair value	$ 0.1		$ 0