Share-Based Compensation (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Oct. 01, 2010	Sep. 30, 2011		Oct. 01, 2010
Total pre-tax share-based compensation expense	$ 3.0	$ 2.1	$ 8.7		$ 7.1
Excess tax benefit on share-based compensation	0.3		1.0	[1]	0.2	[1]
Non-Qualified Stock Option Expense [Member]
Total pre-tax share-based compensation expense	1.2	1.1	3.5		3.2
Non-Vested Stock Awards Expense [Member]
Total pre-tax share-based compensation expense	$ 1.8	$ 1.0	$ 5.2		$ 3.9

[1] Cash inflows (outflows) recognized as financing activities in the condensed consolidated statements of cash flows.