CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($) $ in Millions	Total	Common Stock Issued	Additional Paid-in Capital	Accumulated Deficit	Treasury Stock	Accumulated Other Comprehensive Loss
Balance at Dec. 31, 2018			$ 1,578.1	$ (242.4)	$ (5.3)	$ (33.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ (20.3)			(20.3)
Issuance of common stock upon the exercise or redemption of share-based awards			0.2
Stock-based compensation expense			4.2
Purchases of treasury stock					(1.9)
Other comprehensive income (loss), net of tax						0.7
Balance at Mar. 31, 2019	1,280.1	$ 0.5	1,582.5	(262.7)	(7.2)	(33.0)
Balance at Dec. 31, 2019	1,265.2		1,593.9	(288.3)	(8.9)	(32.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	3.7			3.7
Issuance of common stock upon the exercise or redemption of share-based awards			0.0
Stock-based compensation expense			2.5
Purchases of treasury stock					0.0
Other comprehensive income (loss), net of tax						(14.9)
Balance at Mar. 31, 2020	$ 1,256.5	$ 0.5	$ 1,596.4	$ (284.6)	$ (8.9)	$ (46.9)