Condensed Consolidated Statements of Shareholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Retained Earnings	Accumulated Other Comprehensive Loss	Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of new ASC	$ (0.3)		$ (0.3)
Shares outstanding, beginning (in shares) at Dec. 31, 2018		40.4
Shareholders' equity, beginning at Dec. 31, 2018	473.3	$ 0.0	474.2	$ (0.9)	$ 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	11.6		11.6
Issuance of common stock (in shares)		0.1
Repurchase of common stock (in shares)		(0.3)
Repurchase of common stock	(25.0)	$ (4.7)	(20.3)
Taxes paid related to net share settlement of stock awards (in shares)		(0.1)
Taxes paid related to net share settlement of stock awards	(7.6)		(7.6)
Issuance of restricted stock awards, net of forfeitures		0.1
Stock-based compensation	4.7	$ 4.7
Other	(0.2)		(0.2)
Shares outstanding, ending (in shares) at Mar. 31, 2019		40.2
Shareholders' equity, ending at Mar. 31, 2019	456.9	$ 0.0	457.8	(0.9)	0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of new ASC	(0.5)		(0.5)
Shares outstanding, beginning (in shares) at Dec. 31, 2019		39.7
Shareholders' equity, beginning at Dec. 31, 2019	511.0	$ 0.0	509.2	(0.9)	2.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(23.5)		(23.4)		(0.1)
Repurchase of common stock (in shares)		(0.3)
Repurchase of common stock	(27.9)	$ (4.3)	(23.6)
Cash settlement of stock awards	(12.7)		(12.7)
Taxes paid related to net share settlement of stock awards	(15.1)		(15.1)
Stock-based compensation	4.3	$ 4.3
Shares outstanding, ending (in shares) at Mar. 31, 2020		39.4
Shareholders' equity, ending at Mar. 31, 2020	$ 435.6	$ 0.0	$ 433.9	$ (0.9)	$ 2.6