Investments (Gross Realized Gains And Losses Related To Fixed Income Investments) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 30, 2011		Dec. 31, 2010		Jan. 01, 2010
Investments [Abstract]
Gross realized gains	$ 3.8		$ 14.9		$ 6.0
Gross realized losses	(4.9)	[1]	(2.7)	[1]	(1.3)	[1]
Total	$ (1.1)		$ 12.2		$ 4.7

[1] Includes other-than-temporary impairments of $1.2 million for the year ended December 30, 2011.