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Stockholders’ Equity - Repurchase of Common Stock and Retirement of Treasury Shares (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Aug. 02, 2021	May 31, 2018
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of common stock shares repurchased (in shares)	1,529,575
Value of shares repurchased	$ 79.8
Common stock repurchase (price per share)	$ 52.20
Treasury stock value	$ 80.1	$ 280.2	$ 401.6
Treasury stock retired	80,000,000	0	0
Common Stock
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of common stock shares repurchased (in shares)			35,100
Value of shares repurchased			$ 1.6
Common Stock in Treasury
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Treasury stock retired	80,000,000
August 2021 Share Repurchase Program
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stock repurchase program, authorized amount				$ 1,000.0
Stock repurchase program, remaining authorized repurchase amount	$ 536.5
May 2018 Repurchase Program
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stock repurchase program, authorized amount					$ 1,000.0
Common Stock Repurchase Set Two
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of common stock shares repurchased (in shares)		4,527,887
Value of shares repurchased		$ 280.1
Common stock repurchase (price per share)		$ 61.86
Common Stock Repurchase Set One
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of common stock shares repurchased (in shares)			7,875,407
Common stock repurchase (price per share)			$ 50.96
Treasury stock value			$ 401.4

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