Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2017	$ 1,947.3	$ 0.4	$ 337.3	$ (200.7)	$ 2,139.6	$ (329.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	66.5				66.5
Other comprehensive loss, net of tax	19.9					19.9
Treasury stock issued	0.0		(20.4)	20.4
Stock-based compensation	6.6		6.6
Exercise of stock options and other	12.3		12.3
Ending balance at Apr. 01, 2018	2,055.9	0.4	335.8	(180.3)	2,257.0	(357.0)
Beginning balance at Dec. 30, 2018	2,229.7	0.4	343.7	(144.9)	2,523.7	(493.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	75.3				75.3
Other comprehensive loss, net of tax	23.4					23.4
Treasury stock issued	0.0		(15.0)	15.0
Stock-based compensation	10.9		10.9
Exercise of stock options and other	10.2		10.2
Ending balance at Mar. 31, 2019	$ 2,349.5	$ 0.4	$ 349.8	$ (129.9)	$ 2,599.0	$ (469.8)