Stockholders' Equity and Earnings Per Common Share - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Oct. 25, 2021
Outstanding Restricted Stock and Stock Success Unit Grant Prices Lower Limit		$ 12.45		$ 12.45
Outstanding Restricted Stock and Stock Success Unit Grant Prices Upper Limit		$ 36.45		$ 36.45
Antidilutive Securities Excluded from Computation of Earnings Per Share		100,000	300,000	200,000	900,000
Authorized Amount of Treasury Share Repurchases Under Stock Repurchase Program						$ 250.0
Expiration Date of Share Repurchase Program Authorized in October 2021				Dec. 31, 2022
Number of Treasury Shares Repurchased		1,735,500	0	3,078,600	0
Cost of Shares Repurchased	[1]	$ 57.4	$ 0.0	$ 94.9	$ 0.0
Remaining Amount of Treasury Share Repurchases Authorized Under Stock Repurchase Program		$ 105.1		$ 105.1
Authorized Shares of Preferred Stock		25,000,000.0		25,000,000.0
Par Value Per Share of Preferred Stock		$ 0.10		$ 0.10
Issued Shares of Preferred Stock		0		0
Accelerated Share Repurchase Agreement [Member]
Number of Treasury Shares Repurchased				1,700,000
Cost of Shares Repurchased				$ 50.0
Open Market Share Repurchases [Member]
Number of Treasury Shares Repurchased				1,400,000
Cost of Shares Repurchased				$ 44.9

[1] Includes commissions of $0.1 million for the three and six months ended June 30, 2022.