CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Millions	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Common Stock in Treasury at Cost
Balance at Dec. 31, 2020	$ 2,932.6	$ 0.7	$ 791.4	$ 2,793.5	$ (165.5)	$ (487.5)
Net income (loss)	99.6			99.6
Employee pension and postretirement benefits, net of tax	1.2				1.2
Currency translation adjustments	(20.0)				(20.0)
Cash dividends	(22.7)			(22.7)
Exercise of stock options	18.2		(0.6)			18.8
Stock-based compensation expense	8.3		8.3
Payment of stock-based restricted and performance shares			(0.8)			0.8
Other	1.0			0.6	0.4
Balance at Mar. 31, 2021	3,018.2	0.7	798.3	2,871.0	(183.9)	(467.9)
Balance at Dec. 31, 2021	3,076.4	0.7	792.4	3,110.6	(128.6)	(698.7)
Net income (loss)	(2.1)			(2.1)
Employee pension and postretirement benefits, net of tax	0.4				0.4
Currency translation adjustments	(6.5)				(6.5)
Cash dividends	(24.5)			(24.5)
Repurchases of Common Stock	(85.0)					(85.0)
Exercise of stock options	1.9		(0.2)			2.1
Stock-based compensation expense	6.8		6.8
Payment of stock-based restricted and performance shares			(0.5)			0.5
Shares tendered for taxes on stock-based compensation	(0.4)					(0.4)
Other	1.0		(0.3)		0.8	0.5
Balance at Mar. 31, 2022	$ 2,968.0	$ 0.7	$ 798.2	$ 3,084.0	$ (133.9)	$ (781.0)