Equity - Rollforward of Equity (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022
Increase (Decrease) in Stockholders' Equity
Beginning balance (shares)	37,298,989
Beginning balance	$ 698.3	$ 673.8
Net income (loss)	50.7	60.8
Other comprehensive income (loss)	8.0	(10.1)
Exercise of stock options, net	2.2	0.4
Tax payments related to vested restricted stock units	(4.5)	(1.8)
Share repurchase program	(33.4)	(40.4)
Share-based compensation plans	$ 4.4	3.4
Ending balance (shares)	36,989,048
Ending balance	$ 725.7	$ 686.1
Common Stock
Increase (Decrease) in Stockholders' Equity
Beginning balance (shares)	43,228,000	43,102,000
Beginning balance	$ 0.4	$ 0.4
Common stock issued (shares)	139,000	42,000
Exercise of stock options, net (shares)	41,000	36,000
Ending balance (shares)	43,408,000	43,180,000
Ending balance	$ 0.4	$ 0.4
Additional paid in capital
Increase (Decrease) in Stockholders' Equity
Beginning balance	153.0	136.3
Exercise of stock options, net	2.2	0.4
Tax payments related to vested restricted stock units	0.0
Share-based compensation plans	3.7	2.9
Ending balance	158.9	139.6
Retained earnings
Increase (Decrease) in Stockholders' Equity
Beginning balance	1,007.7	796.1
Net income (loss)	50.7	60.8
Ending balance	1,058.4	856.9
Accumulated other comprehensive income (loss)
Increase (Decrease) in Stockholders' Equity
Beginning balance	(46.8)	13.1
Other comprehensive income (loss)	8.0	(10.1)
Ending balance	(38.8)	3.0
Treasury stock
Increase (Decrease) in Stockholders' Equity
Beginning balance	(416.0)	(272.1)
Tax payments related to vested restricted stock units	(4.5)	(1.8)
Share repurchase program	(33.4)	(40.4)
Share-based compensation plans	0.7	0.5
Ending balance	$ (453.2)	$ (313.8)

Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures, Cancellation

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