Condensed Consolidated Statements of Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Retained Earnings	Treasury Stock
Balance at beginning of period at Dec. 31, 2018		$ 0.4	$ 584.8	$ (116.6)	$ 189.6	$ (56.9)
Balance (in shares) at Dec. 31, 2018		35,588,833
Increase (Decrease) in Stockholders' Equity
Stock options exercised and issuance of other stock awards			(2.1)			2.4
Stock options exercised (in shares)		58,404
Restricted stock, net (in shares)		145,482
Performance shares issued (in shares)		54,860
Common stock repurchases (in shares)		(473,042)
Common stock repurchases						(7.4)
Stock-based compensation			9.5
Other comprehensive loss				(4.4)
Net loss					46.6
Balance at end of period at Dec. 31, 2019	$ 645.9	$ 0.4	592.2	(121.0)	236.2	(61.9)
Balance (in shares) at Dec. 31, 2019		35,374,537
Increase (Decrease) in Stockholders' Equity
Stock options exercised and issuance of other stock awards			(1.9)			1.7
Stock options exercised (in shares)		11,250
Restricted stock, net (in shares)		118,009
Performance shares issued (in shares)		66,419
Common stock repurchases (in shares)		(1,061,711)
Common stock repurchases		$ (12.0)				(12.0)
Stock-based compensation			3.4
Other comprehensive loss				(12.4)
Adoption of accounting standard updates					(0.2)
Net loss	(7.8)				(7.8)
Balance at end of period at Mar. 31, 2020	$ 616.7	$ 0.4	$ 593.7	$ (133.4)	$ 228.2	$ (72.2)
Balance (in shares) at Mar. 31, 2020		34,508,504