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Stockholders' Equity - (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	900,000		900,000
Equity-based compensation expense	$ 4.0	$ 3.8	$ 9.6	$ 6.9
Share-based Payment Arrangement, Expense, Tax Benefit	1.0	1.0	2.4	1.8
Payment, Tax Withholding, Share-based Payment Arrangement	0.0	$ 0.0	2.5	$ 1.7
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 16.4		$ 16.4
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of share-based awards granted			220,518
Grant-date fair value of awards per share			$ 29.52
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of share-based awards granted			103,067
Grant-date fair value of awards per share			$ 30.55

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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