Shareholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Equity, Class of Treasury Stock [Line Items]
Additional shares authorized	$ 1,109.3		$ 1,109.3
Repurchase and retirement of common stock		$ 66.3	$ 2.4	$ 82.3
Cash dividend paid during period, per share (in dollars per share)	$ 0.67	$ 0.66	$ 1.34	$ 1.32
Common stock excluded from calculation of diluted earnings per share (shares)	3.3	2.9	3.2	2.4
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)	0.2		0.2
Common Stock
Equity, Class of Treasury Stock [Line Items]
Repurchase and retirement of common stock (shares)		0.8	0.1	1.0