Stockholders' Equity - Narrative (Detail) - USD ($)		12 Months Ended
	Oct. 19, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jul. 31, 2018
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)		10,000,000	10,000,000
Proceeds from issuance of preferred stock		$ 0	$ 0	$ 392,500,000
Treasury stock, shares, acquired (in shares)		2,527,544
Treasury stock, share-based compensation shares, acquired (in shares)		394,326
Treasury stock, value, acquired, cost method		$ 267,600,000	$ 299,800,000	$ 1,100,200,000
Number of shares authorized to be repurchased (in shares)					25,000,000
Average price paid per share for common stock repurchased (in dollars per share)		$ 105.90	$ 91.49	$ 93.40
Series D Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares outstanding (in shares)		5,000	5,000
Per share ownership interest, percentage		1.00%
Preferred stock		$ 493,500,000	$ 493,500,000
Preferred stock, par value (in dollars per share)		$ 0
Preferred stock, liquidation preference		$ 100,000
Depository shares, liquidation preference (in dollars per share)		$ 1,000
Preferred stock, annual dividend rate		4.60%
Preferred stock, variable rate		3.202%
Series E Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares outstanding (in shares)		16,000	16,000
Per share ownership interest, percentage		0.10%
Preferred stock		$ 391,400,000	$ 391,400,000
Preferred stock, par value (in dollars per share)		$ 0
Preferred stock, liquidation preference		$ 25,000
Depository shares, liquidation preference (in dollars per share)		$ 25
Preferred stock, annual dividend rate		4.70%
Proceeds from issuance of preferred stock		$ 391,400,000	$ 391,400,000
Preferred stock, dividends per share, declared (in dollars per share)	$ 293.75
Series D Preferred Stock, Depositary Shares
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)		500,000
Series E Preferred Stock, Depositary Shares
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)		16,000,000