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Stockholders' Equity - Narrative (Detail) - USD ($)
12 Months Ended
Oct. 20, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
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 $ 392,500,000 $ 0  
Number of shares authorized to be repurchased (in shares)         25,000,000.0
Treasury stock, shares, acquired (in shares)   3,276,589      
Treasury stock, share-based compensation shares, acquired (in shares)   532,713      
Treasury stock, value, acquired, cost method   $ 299,800,000 $ 1,100,200,000 $ 924,300,000  
Average price paid per share for common stock repurchased (in dollars per share)   $ 91.49 $ 93.40 $ 102.69  
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