Net Income Per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Oct. 03, 2015	Sep. 27, 2014	Oct. 03, 2015	Sep. 27, 2014
Net income per common share amounts
Income from continuing operations	$ 81.3	$ 60.9	$ 217.9	$ 177.5
Income (loss) from discontinued operations, net of tax	0.4	(0.7)	(0.6)	(3.0)
Net income	$ 81.7	$ 60.2	$ 217.3	$ 174.5
Weighted average number of common shares outstanding	91.5	93.3	91.1	94.7
Dilutive shares (additional common shares issuable under stock-based awards)	1.7	1.9	1.8	1.9
Weighted average number of common shares outstanding, assuming dilution	93.2	95.2	92.9	96.6
Net income (loss) per common share:
Continuing operations (in dollars per share)	$ 0.89	$ 0.65	$ 2.39	$ 1.87
Discontinued operations (in dollars per share)	0.00	0.00	0.00	(0.03)
Net income per common share (in dollars per share)	0.89	0.65	2.39	1.84
Net income (loss) per common share, assuming dilution:
Continuing operations (in dollars per share)	0.87	0.64	2.35	1.84
Discontinued operations (in dollars per share)	0.01	(0.01)	(0.01)	(0.03)
Net income per common share, assuming dilution (in dollars per share)	$ 0.88	$ 0.63	$ 2.34	$ 1.81
Stock-based compensation awards excluded from the computation of net income per common share, assuming dilution	0.5	3.0	1.0	3.0