Share-Based Payments Compensation Expense (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 24, 2011	Sep. 25, 2010	Sep. 24, 2011	Sep. 25, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
After-tax compensation expense (in dollars)	$ 3.6	$ 4.9	$ 14.0	$ 17.2
Options and SOSARs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax compensation expense (in dollars)	0.8	0.8	4.7	5.5
Tax benefit (in dollars)	(0.2)	(0.2)	(1.3)	(1.5)
After-tax compensation expense (in dollars)	0.6	0.6	3.4	4.0
RSUs and DSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax compensation expense (in dollars)	2.5	3.9	7.9	12.2
Tax benefit (in dollars)	(0.7)	(1.0)	(2.0)	(3.2)
After-tax compensation expense (in dollars)	1.8	2.9	5.9	9.0
PUs and PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax compensation expense (in dollars)	1.7	1.8	6.7	5.5
Tax benefit (in dollars)	(0.5)	(0.4)	(2.0)	(1.3)
After-tax compensation expense (in dollars)	$ 1.2	$ 1.4	$ 4.7	$ 4.2