Net Income Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 29, 2013	Jun. 30, 2012	Jun. 29, 2013	Jun. 30, 2012
Net income per common share amounts
Income from continuing operations	$ 70.8	$ 49.1	$ 137.6	$ 93.7
(Loss) income from discontinued operations, net of tax	(2.0)	15.1	(11.0)	14.4
Net income	$ 68.8	$ 64.2	$ 126.6	$ 108.1
Weighted-average number of common shares outstanding	99.3	103.4	99.7	104.6
Dilutive shares (additional common shares issuable under employee stock-based awards)	1.5	0.9	1.6	0.7
Weighted-average number of common shares outstanding, assuming dilution	100.8	104.3	101.3	105.3
Net income per common share:
Continuing operations (in dollars per share)	$ 0.71	$ 0.47	$ 1.38	$ 0.89
Discontinued operations (in dollars per share)	$ (0.02)	$ 0.15	$ (0.11)	$ 0.14
Net income per common share (in dollars per share)	$ 0.69	$ 0.62	$ 1.27	$ 1.03
Net income per common share, assuming dilution:
Continuing operations (in dollars per share)	$ 0.70	$ 0.47	$ 1.36	$ 0.89
Discontinued operations (in dollars per share)	$ (0.02)	$ 0.15	$ (0.11)	$ 0.14
Net income per common share, assuming dilution (in dollars per share)	$ 0.68	$ 0.62	$ 1.25	$ 1.03
Stock-based compensation awards excluded from the computation of net income per common share, assuming dilution	5	11	6	12