Benefit Plans (Schedule Of Amounts Included In Accumulated Other Comprehensive Income, Net Of Tax Which Have Not Yet Been Recognized In Net Periodic Benefit Cost) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Jan. 01, 2011	Jan. 02, 2010
Benefit Plans [Abstract]
Unamortized prior service benefit	$ (0.4)	$ (0.5)	$ (0.6)
Unrecognized net actuarial gain (loss)	8.5	5.8	(6.9)
Unamortized prior service benefit (actuarial loss)	$ 8.1	$ 5.3	$ (7.5)