Shareholders' Equity (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended
	Dec. 15, 2025	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Stockholders Equity Note Disclosure [Line Items]
Share repurchase (in shares)		2.0
Share repurchases		$ 200.0	$ 50.0
Dividends (in dollars per share)		$ 0.27	$ 0.25
Dividends payable		$ 43.6		$ 44.1
December 2025 Share Repurchase Program
Stockholders Equity Note Disclosure [Line Items]
Share repurchase program, authorized amount	$ 1,000.0
Share repurchase program remaining available amount		$ 800.0
Common stock authorized for repurchase, expiration date	Dec. 31, 2028