Share-Based Payments Compensation Expense (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 26, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
After-tax compensation expense (in dollars)	$ 3.3	$ 5.9
Options and SOSARs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax compensation expense (in dollars)	1.8	2.8
Tax benefit (in dollars)	(0.5)	(0.8)
After-tax compensation expense (in dollars)	1.3	2.0
RSUs and DSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax compensation expense (in dollars)	2.0	2.3
Tax benefit (in dollars)	(0.6)	(0.5)
After-tax compensation expense (in dollars)	1.4	1.8
PUs and PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax compensation expense (in dollars)	1.0	3.0
Tax benefit (in dollars)	(0.4)	(0.9)
After-tax compensation expense (in dollars)	$ 0.6	$ 2.1