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			0.3			5.3
Stock-based compensation expense			6.4
Other comprehensive loss				(21.1)
Net income (loss)	$ 14.6				14.6
Common stock repurchases
Balance at end of period at Sep. 30, 2021	649.0	0.4	601.8	(118.6)	231.5	(66.1)
Balance at beginning of period at Jun. 30, 2021		0.4	600.1	(109.5)	231.7	(66.5)
Increase (Decrease) in Stockholders' Equity
Stock options exercised and issuance of other stock awards			0.1			0.4
Stock-based compensation expense			1.6
Other comprehensive loss				(9.1)
Net income (loss)	(0.2)				(0.2)
Common stock repurchases
Balance at end of period at Sep. 30, 2021	649.0	0.4	601.8	(118.6)	231.5	(66.1)
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			(4.0)			3.1
Stock-based compensation expense			5.6
Other comprehensive loss				(54.8)
Net income (loss)	20.5				20.5
Common stock repurchases						(1.9)
Balance at end of period at Sep. 30, 2022	630.9	0.4	604.0	(157.2)	248.4	(64.7)
Balance at beginning of period at Jun. 30, 2022		0.4	602.5	(131.1)	246.1	(64.7)
Increase (Decrease) in Stockholders' Equity
Stock options exercised and issuance of other stock awards
Stock-based compensation expense			1.5
Other comprehensive loss				(26.1)
Net income (loss)	2.3				2.3
Common stock repurchases
Balance at end of period at Sep. 30, 2022	$ 630.9	$ 0.4	$ 604.0	$ (157.2)	$ 248.4	$ (64.7)