Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Millions	Total	$0.001 Par Value Common Stock	Additional Paid-In Capital	Treasury Stock	Accumulated Other Comprehensive Loss	Retained Earnings
Balance (in shares) at Dec. 31, 2018		52,400,000		1,200,000
Balance at Dec. 31, 2018	$ 1,010.9	$ 0.1	$ 688.6	$ (39.6)	$ (5.5)	$ 367.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Employee equity plans activity (in shares)		200,000
Employee equity plans activity	1.6		1.6	$ 0.0
Net income	(26.0)					(26.0)
Other comprehensive income	1.0				1.0
Balance (in shares) at Mar. 31, 2019		52,600,000		1,200,000
Balance at Mar. 31, 2019	$ 987.5	$ 0.1	690.2	$ (39.6)	(4.5)	341.3
Balance (in shares) at Dec. 31, 2019	53,000,000.0	53,000,000.0		1,200,000
Balance at Dec. 31, 2019	$ 1,088.5	$ 0.1	716.1	$ (39.6)	(9.9)	421.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Employee equity plans activity (in shares)		500,000
Employee equity plans activity	10.1		10.1	$ 0.0
Net income	(12.5)					(12.5)
Other comprehensive income	$ (11.3)				(11.3)
Balance (in shares) at Mar. 31, 2020	53,500,000.0	53,500,000		1,200,000
Balance at Mar. 31, 2020	$ 1,074.8	$ 0.1	$ 726.2	$ (39.6)	$ (21.2)	$ 409.3