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Earnings Per Share - Common Stock Reconciliation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 30, 2018	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 31, 2017	Oct. 01, 2017	Jul. 02, 2017	Apr. 02, 2017	Dec. 30, 2018	Dec. 31, 2017	Jan. 01, 2017
Earnings Per Share [Abstract]
Net earnings	$ (23.9)	$ 33.1	$ (15.4)	$ 29.1	$ 17.7	$ 23.0	$ 18.7	$ 12.2	$ 22.9	$ 71.6	$ 120.8
Less: Earnings allocated to participating securities									(0.2)	(1.1)	(2.6)
Net earnings available to common shareholders									$ 22.7	$ 70.5	$ 118.2
Average common shares outstanding (millions):
Basic (in shares)									38.8	38.3	38.1
Dilutive share awards (in shares)									0.3	0.7	0.3
Diluted (in shares)									39.1	39.0	38.4
Basic earnings (loss) per share on common stock (in dollars per share)	$ (0.62)	$ 0.84	$ (0.40)	$ 0.74	$ 0.46	$ 0.59	$ 0.48	$ 0.31	$ 0.59	$ 1.84	$ 3.10
Diluted earnings (loss) per share on common stock (in dollars per share)	$ (0.62)	$ 0.84	$ (0.40)	$ 0.74	$ 0.45	$ 0.58	$ 0.47	$ 0.31	$ 0.58	$ 1.81	$ 3.08

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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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