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, 2022		74,800
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
Issuance of common stock (in shares)		200
Taxes paid related to net share settlement of stock awards (in shares)		(100)
Taxes paid related to net share settlement of stock awards	(11.3)	$ (8.6)	(2.7)
Stock-based compensation	8.6	$ 8.6
Other	(0.3)		(0.3)
Shares outstanding, ending (in shares) at Mar. 31, 2023		74,900
Shareholders' equity, ending at Mar. 31, 2023	704.2	$ 0.0	705.1	(0.9)
Shares outstanding, beginning (in shares) at Dec. 31, 2023		74,500
Shareholders' equity, beginning at Dec. 31, 2023	893.6	$ 0.0	894.5	(0.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	80.4		80.4
Issuance of common stock (in shares)		300
Repurchase of common stock (in shares)		(1,200)
Repurchase of common stock	(145.7)	$ (7.2)	(138.5)
Taxes paid related to net share settlement of stock awards (in shares)		(100)
Taxes paid related to net share settlement of stock awards	(7.6)		(7.6)
Stock-based compensation	7.2	$ 7.2
Other	(1.0)		(1.0)
Shares outstanding, ending (in shares) at Mar. 31, 2024		73,500
Shareholders' equity, ending at Mar. 31, 2024	$ 826.9	$ 0.0	$ 827.8	$ (0.9)