Shareholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Equity, Class of Treasury Stock [Line Items]
Additional shares authorized	$ 1,100.0		$ 1,100.0
Repurchase and retirement of common stock			$ 2.4	$ 82.3
Cash dividend paid during period, per share (in dollars per share)	$ 0.67	$ 0.66	$ 2.01	$ 1.98
Common stock excluded from calculation of diluted earnings per share (shares)	2.9	2.9	3.3	2.7
Stock Options and Certain Share-based Compensation Awards
Equity, Class of Treasury Stock [Line Items]
Common stock excluded from calculation of diluted earnings per share (shares)	0.6		0.3
Common Stock
Equity, Class of Treasury Stock [Line Items]
Repurchase and retirement of common stock (shares)			0.1	1.0