Net Income Per Common Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
Apr. 04, 2015	Mar. 29, 2014
Net income per common share amounts
Income from continuing operations	$ 71.6	$ 71.6
Loss (income) from discontinued operations, net of tax		(0.4)
Net income	$ 71.6	$ 71.2
Weighted-average number of common shares outstanding	90.6	96.1
Dilutive shares (additional common shares issuable under stock-based awards)	1.8	1.9
Weighted-average number of common shares outstanding, assuming dilution	92.4	98.0
Net income (loss) per common share:
Continuing operations (in dollars per share)	$ 0.79	$ 0.74
Discontinued operations (in dollars per share)	$ 0.00	$ 0.00
Net income per common share (in dollars per share)	$ 0.79us-gaap_EarningsPerShareBasic	$ 0.74us-gaap_EarningsPerShareBasic
Net income (loss) per common share, assuming dilution:
Continuing operations (in dollars per share)	$ 0.77	$ 0.73
Discontinued operations (in dollars per share)	$ 0.00	$ 0.00
Net income per common share, assuming dilution (in dollars per share)	$ 0.77us-gaap_EarningsPerShareDiluted	$ 0.73us-gaap_EarningsPerShareDiluted
Stock-based compensation awards excluded from the computation of net income per common share, assuming dilution	1	4

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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