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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		9 Months Ended
	Sep. 29, 2019	Sep. 30, 2018	Sep. 29, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Net earnings (loss)	$ (10.5)	$ 33.1	$ 95.4	$ 46.8
Less: earnings allocated to participating securities	0.0	(0.4)	(1.0)	(0.5)
Net earnings (loss) available to common shareholders	$ (10.5)	$ 32.7	$ 94.4	$ 46.3
Average shares outstanding (millions):
Basic (in shares)	39.1	38.8	39.0	38.7
Dilutive share awards (in shares)	0.0	0.1	0.2	0.1
Diluted (in shares)	39.1	38.9	39.2	38.8
Basic earnings (loss) per share on common stock (in dollars per share)	$ (0.27)	$ 0.84	$ 2.42	$ 1.20
Diluted earnings (loss) per share on common stock (in dollars per share)	$ (0.27)	$ 0.84	$ 2.41	$ 1.19

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Net earnings after earnings distributed and allocated to participating securities 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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