Stockholders' Equity and Earnings Per Common Share - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2024		Jun. 30, 2023	Jun. 30, 2024		Jun. 30, 2023
Stockholders Equity and Earnings Per Common Share Additional Information [Abstract]
Outstanding Restricted Stock and Stock Success Unit Grant Prices Lower Limit	$ 18.78			$ 18.78
Outstanding Restricted Stock and Stock Success Unit Grant Prices Upper Limit	$ 52.40			$ 52.40
Antidilutive Securities Excluded from Computation of Earnings Per Share			800,000	300,000		700,000
Cost of Shares Repurchased	$ 179.8	[1]	$ 47.0	$ 302.8	[1]	$ 100.6
Number of Treasury Shares Repurchased	3,500,000		1,100,000	6,000,000.0		2,400,000
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

[1] 1Includes a de minimis amount of commissions for the three and six months ended June 30, 2024 and $0.1 million of commissions for the three and six months ended June 30, 2023. Also includes $1.7 million and $2.8 million of excise tax for the three and six months ended June 30, 2024, respectively, and $0.4 million and $0.5 million of excise tax for the three and six months ended June 30, 2023, respectively.