Net Income Per Share (Details) (USD $) In Millions, except Per Share data	3 Months Ended		6 Months Ended
	Jul. 02, 2011	Jul. 03, 2010	Jul. 02, 2011	Jul. 03, 2010
Net income (loss) per common share
(A) Net income available to common shareholders	$ 73.3	$ 83.8	$ 118.1	$ 138.5
(B) Weighted-average number of common shares outstanding	105.7	105.6	105.6	105.5
Dilutive shares (additional common shares issuable under employee stock-based awards)	1.2	1.2	1.2	1.1
(C) Weighted-average number of common shares outstanding, assuming dilution	106.9	106.8	106.8	106.6
Net income per common share (A) / (B)	$ 0.69	$ 0.79	$ 1.12	$ 1.31
Net income per common share, assuming dilution (A) / (C)	$ 0.69	$ 0.78	$ 1.11	$ 1.30
Net Income Per Share (Textuals) [Abstract]
Employee stock-based awards excluded from the computation of net income per common share, assuming dilution	10	8	11	9