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, 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
Stock-based compensation			2.5
Other comprehensive loss				(10.6)
Net income (loss)	$ (3.1)				(3.1)
Balance at end of period at Mar. 31, 2021	633.0	0.4	596.4	(108.1)	213.8	(69.5)
Balance at beginning of period at Dec. 31, 2021		0.4	602.4	(102.4)	227.9	(65.9)
Increase (Decrease) in Stockholders' Equity
Stock options exercised and issuance of other stock awards			(3.8)			3.0
Stock-based compensation			3.1
Other comprehensive loss				(6.3)
Net income (loss)	3.1				3.1
Balance at end of period at Mar. 31, 2022	$ 661.5	$ 0.4	$ 601.7	$ (108.7)	$ 231.0	$ (62.9)