Shareholder's Equity (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 15, 2025	Dec. 31, 2020
Shareholders Equity
Common stock, shares authorized	426,000,000.0	426,000,000.0
Common stock, par value (per share)	$ 0.01	$ 0.01
Share repurchases	$ 225,000,000.0	$ 150,000,000.0
Dividends payable amount per share	$ 0.27
Increase to quarterly dividend rate				8.00%
Dividends payable	$ 44,100,000	$ 41,200,000
Dividends paid per common share	$ 1.00	$ 0.92	$ 0.88
Restricted Stock Units
Shareholders Equity
Tax benefit realized for tax deductions from option exercises	$ 3,400,000	$ 3,400,000	$ 2,700,000
December 2020 Share Repurchase Program
Shareholders Equity
Authorized amount to repurchase shares of common stock					$ 750,000,000.0
December 2025 Share Repurchase Program
Shareholders Equity
Authorized amount to repurchase shares of common stock	1,000,000,000.0
Remaining authorized repurchase amount	$ 1,000,000,000.0
Common shares | December 2020 Share Repurchase Program
Shareholders Equity
Share repurchase (in shares)	2,300,000	1,600,000
Capital contribution reserve | December 2020 Share Repurchase Program
Shareholders Equity
Share repurchases	$ 225,000,000.0	$ 150,000,000.0