Consolidated Statements of Shareholders' Equity - USD ($) $ in Millions	Total	Common Stock	Retained Earnings	Accumulated Other Comprehensive Loss
Shares outstanding, beginning (in shares) at Dec. 31, 2020		79,000,000.0
Shareholders' equity, beginning at Dec. 31, 2020	$ 367.1	$ 18.2	$ 349.8	$ (0.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	249.1		249.1
Issuance of common stock (in shares)		400,000
Issuance of common stock	$ 2.5	$ 2.5
Repurchase of common stock (in shares)	(942,728)	(3,000,000.0)
Repurchase of common stock	$ (297.5)	$ (48.5)	(249.0)
Taxes paid related to net share settlement of stock awards (in shares)		(200,000)
Taxes paid related to net share settlement of stock awards	(16.1)		(16.1)
Stock-based compensation	27.8	$ 27.8
Cash dividends	(26.1)		(26.1)
Shareholders' equity, ending at Dec. 31, 2021	306.8	$ 0.0	307.7	(0.9)
Shares outstanding, ending (in shares) at Dec. 31, 2021		76,200,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	439.4		439.4
Issuance of common stock (in shares)		600,000
Issuance of common stock	$ 2.7	$ 2.7
Repurchase of common stock (in shares)	(1,747,844)	(1,800,000)
Repurchase of common stock	$ (175.5)	$ (34.5)	(141.0)
Taxes paid related to net share settlement of stock awards (in shares)		(200,000)
Taxes paid related to net share settlement of stock awards	(26.9)		(26.9)
Stock-based compensation	31.8	$ 31.8
Cash dividends	(26.8)		(26.8)
Shareholders' equity, ending at Dec. 31, 2022	551.5	$ 0.0	552.4	(0.9)
Shares outstanding, ending (in shares) at Dec. 31, 2022		74,800,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	417.3		417.3
Issuance of common stock (in shares)		300,000
Issuance of common stock	$ 3.1	$ 3.1
Repurchase of common stock (in shares)	(461,761)	(500,000)
Repurchase of common stock	$ (55.3)	$ (36.0)	(19.3)
Taxes paid related to net share settlement of stock awards (in shares)		(100,000)
Taxes paid related to net share settlement of stock awards	(26.5)		(26.5)
Stock-based compensation	32.9	$ 32.9
Cash dividends	(28.5)		(28.5)
Other	(0.9)		(0.9)
Shareholders' equity, ending at Dec. 31, 2023	$ 893.6	$ 0.0	$ 894.5	$ (0.9)
Shares outstanding, ending (in shares) at Dec. 31, 2023		74,500,000