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Earnings Per Share - Reconciliation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Apr. 03, 2016	Mar. 29, 2015
Earnings Per Share [Abstract]
Net earnings	$ 11.2	$ 3.7
Less: earnings allocated to participating securities	(0.3)	(0.1)
Net earnings available to common shareholders	$ 10.9	$ 3.6
Basic earnings per share on common stock (in dollars per share)	$ 0.29	$ 0.10
Diluted earnings per share on common stock (in dollars per share)	$ 0.29	$ 0.10
Average common shares outstanding (millions):
Basic (in shares)	38.0	37.7
Diluted (in shares)	38.2	37.8

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Net earnings after earnings distributed and allocated to participating securities under the two-class method.

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Amount of earnings (loss) distributed and earnings (loss) allocated to participating securities for the basic and diluted earnings (loss) per share or per unit calculation under the two-class method.

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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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