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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
	Mar. 31, 2019	Apr. 01, 2018
Earnings Per Share [Abstract]
Net earnings	$ 22.1	$ 29.1
Less: earnings allocated to participating securities	(0.2)	(0.4)
Net earnings available to common shareholders	$ 21.9	$ 28.7
Average shares outstanding (millions):
Basic (in shares)	39.0	38.6
Dilutive share awards (in shares)	0.1	0.3
Diluted (in shares)	39.1	38.9
Basic earnings per share on common stock (in dollars per share)	$ 0.56	$ 0.74
Diluted earnings per share on common stock (in dollars per share)	$ 0.56	$ 0.74

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

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