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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. 02, 2017	Apr. 03, 2016
Earnings Per Share [Abstract]
Net earnings	$ 12.2	$ 11.2
Less: earnings allocated to participating securities	(0.2)	(0.3)
Net earnings available to common shareholders	$ 12.0	$ 10.9
Average shares outstanding (millions):
Basic (in shares)	38.3	38.0
Dilutive share awards (in shares)	0.4	0.2
Diluted (in shares)	38.7	38.2
Basic earnings per share on common stock (in dollars per share)	$ 0.31	$ 0.29
Diluted earnings per share on common stock (in dollars per share)	$ 0.31	$ 0.29

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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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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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