Condensed Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Millions	Total	Common Stock	Retained Earnings	Accumulated Other Comprehensive Loss
Shares outstanding, beginning (in shares) at Dec. 31, 2021		38,100
Shareholders' equity, beginning at Dec. 31, 2021	$ 306.8	$ 0.0	$ 307.7	$ (0.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	42.1		42.1
Issuance of common stock (in shares)		100
Repurchase of common stock (in shares)		(100)
Repurchase of common stock	(25.0)	$ (7.0)	(18.0)
Taxes paid related to net share settlement of stock awards (in shares)		(100)
Taxes paid related to net share settlement of stock awards	(13.1)		(13.1)
Stock-based compensation	7.0	$ 7.0
Shares outstanding, ending (in shares) at Mar. 31, 2022		38,000
Shareholders' equity, ending at Mar. 31, 2022	317.8	$ 0.0	318.7	(0.9)
Shares outstanding, beginning (in shares) at Dec. 31, 2022		37,400
Shareholders' equity, beginning at Dec. 31, 2022	551.5	$ 0.0	552.4	(0.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	155.7		155.7
Repurchase of common stock		(3.9)	3.9
Taxes paid related to net share settlement of stock awards	(11.3)		(11.3)
Stock-based compensation	8.6	$ 8.6
Other	(0.3)		(0.3)
Shares outstanding, ending (in shares) at Mar. 31, 2023		37,400
Shareholders' equity, ending at Mar. 31, 2023	$ 704.2	$ 4.7	$ 700.4	$ (0.9)