Net Income Per Common Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 28, 2015	Mar. 29, 2014
Net Income Per Common Share [Line Items]
Net income	$ 29.5us-gaap_NetIncomeLoss	$ 52.2us-gaap_NetIncomeLoss
Weighted-average shares of common stock outstanding	49.7	50.2
Common equivalent shares:
Assumed exercise of dilutive options, restricted shares, restricted stock units and performance share units	0.6	0.9
Weighted-average common and common equivalent shares outstanding	50.3	51.1
Basic earnings per share	$ 0.59us-gaap_EarningsPerShareBasic	$ 1.04us-gaap_EarningsPerShareBasic
Diluted earnings per share	$ 0.59us-gaap_EarningsPerShareDiluted	$ 1.02us-gaap_EarningsPerShareDiluted
Shares excluded from the determination of potential common stock because inclusion would have been anti-dilutive	0.6	0.4

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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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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