Postretirement Plans (Summary Of Amounts Recognized In Consolidated Balance Sheets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Jan. 01, 2011
Defined Benefit Plan Disclosure [Line Items]
Accrued benefits	$ (6.0)	$ (4.1)
Retiree health care benefits	(52.8)	(59.6)
Net liability	323.6	244.4
U.S. Postretirement Health Care Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Accrued benefits	(6.5)	(7.8)
Retiree health care benefits	(52.8)	(59.6)
Net liability	$ (59.3)	$ (67.4)