Pension Plans (Summary Of Amounts Included In Accumulated Other Comprehensive Income (Loss)) (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Net gain (loss), tax	$ 147.1	$ 155.6
Prior service cost, tax	$ 2.5	$ 1.9