Shareholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Equity, Class of Treasury Stock [Line Items]
Repurchase and retirement of common stock	$ 38.3		$ 101.1	$ 172.3
Number of shares authorized to be repurchased (in shares)	262.2		262.2
Cash dividend paid during period, per share (in dollars per share)	$ 0.65	$ 0.64	$ 1.30	$ 1.28
Common stock excluded from calculation of diluted earnings per share (shares)	1.8		1.7	1.6
Common Stock
Equity, Class of Treasury Stock [Line Items]
Repurchase and retirement of common stock (shares)	0.4		0.9	1.5