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			0.2			4.9
Stock-based compensation expense			4.8
Other comprehensive loss				(12.0)
Net income	$ 14.8				14.8
Common stock repurchases
Balance at end of period at Jun. 30, 2021	656.2	0.4	600.1	(109.5)	231.7	(66.5)
Balance at beginning of period at Mar. 31, 2021		0.4	596.4	(108.1)	213.8	(69.5)
Increase (Decrease) in Stockholders' Equity
Stock options exercised and issuance of other stock awards			1.4			3.0
Stock-based compensation expense			2.3
Other comprehensive loss				(1.4)
Net income	17.9				17.9
Common stock repurchases
Balance at end of period at Jun. 30, 2021	656.2	0.4	600.1	(109.5)	231.7	(66.5)
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			(3.9)			3.1
Stock-based compensation expense			4.0
Other comprehensive loss				(28.7)
Net income	18.2				18.2
Common stock repurchases						(1.9)
Balance at end of period at Jun. 30, 2022	653.2	0.4	602.5	(131.1)	246.1	(64.7)
Balance at beginning of period at Mar. 31, 2022		0.4	601.7	(108.7)	231.0	(62.9)
Increase (Decrease) in Stockholders' Equity
Stock options exercised and issuance of other stock awards			(0.1)			0.1
Stock-based compensation expense			0.9
Other comprehensive loss				(22.4)
Net income	15.1				15.1
Common stock repurchases						(1.9)
Balance at end of period at Jun. 30, 2022	$ 653.2	$ 0.4	$ 602.5	$ (131.1)	$ 246.1	$ (64.7)