Stockholders' Equity and Earnings Per Common Share - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2024		Sep. 30, 2023	Sep. 30, 2024		Sep. 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				200,000		400,000
Cost of Shares Repurchased	$ 202.0	[1]	$ 74.8	$ 504.8	[1]	$ 175.4
Number of Treasury Shares Repurchased	3,700,000		1,500,000	9,700,000		3,900,000
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 nine months ended September 30, 2024 and a de minimis amount and $0.1 million of commissions for the three and nine months ended September 30, 2023, respectively. Also includes $2.0 million and $4.8 million of excise tax for the three and nine months ended September 30, 2024, respectively, and $0.7 million and $1.2 million of excise tax for the three and nine months ended September 30, 2023, respectively.