Condensed Consolidated Statements of Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	AOCI Attributable to Parent	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Treasury Stock
Balance at beginning of period at Dec. 31, 2019		$ 0.4	$ 592.2	$ (121.0)	$ 236.2	$ (0.2)	$ (61.9)
Increase (Decrease) in Stockholders' Equity
Stock options exercised and issuance of other stock awards			(1.9)				1.7
Common stock repurchases							(12.0)
Stock-based compensation			3.4
Other comprehensive income (loss)				(12.4)
Net loss	$ (7.8)
Balance at end of period at Mar. 31, 2020	616.7	0.4	593.7	(133.4)	228.2		(72.2)
Balance at beginning of period at Dec. 31, 2020		0.4	595.1	(97.5)	216.9		(71.4)
Increase (Decrease) in Stockholders' Equity
Stock options exercised and issuance of other stock awards			(1.2)				1.9
Common stock repurchases		10.6
Stock-based compensation			2.5
Other comprehensive income (loss)				(10.6)
Net loss	(3.1)
Balance at end of period at Mar. 31, 2021	$ 633.0	$ 0.4	$ 596.4	$ (108.1)	$ 213.8		$ (69.5)