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. 29, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Net earnings (loss)	$ (153.2)	$ 22.1
Less: earnings allocated to participating securities	0.0	(0.2)
Net earnings (loss) available to common shareholders	$ (153.2)	$ 21.9
Average shares outstanding (millions):
Basic (in shares)	39.2	39.0
Dilutive share awards (in shares)	0.0	0.1
Diluted (in shares)	39.2	39.1
Basic earnings (loss) per share on common stock (in dollars per share)	$ (3.91)	$ 0.56
Diluted earnings (loss) per share on common stock (in dollars per share)	$ (3.91)	$ 0.56