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Subsequent Events (Detail)
$ / shares in Units, € in Millions
May 06, 2020
USD ($)
$ / shares
Apr. 15, 2020
EUR (€)
Apr. 15, 2020
USD ($)
Dec. 31, 2020
Mar. 31, 2020
USD ($)
Oct. 08, 2019
Subsequent Event [Line Items]            
Equity method investment, ownership percentage           20.00%
Subsequent Event            
Subsequent Event [Line Items]            
Cash dividends declared (in dollars per share) | $ / shares $ 2.66          
GIC | GIC, Singapore Sovereign Wealth Fund            
Subsequent Event [Line Items]            
Equity method investment, ownership percentage           80.00%
Revolving Credit Facility | Line of Credit            
Subsequent Event [Line Items]            
Amount available to borrow         $ 1,700,000,000  
Revolving Credit Facility | Line of Credit | Subsequent Event            
Subsequent Event [Line Items]            
Payment on revolving credit facility $ 250,000,000.0          
Amount available to borrow $ 1,900,000,000          
Notes Payable | Senior Unsecured 364-Day Term Loan Facilities | Subsequent Event            
Subsequent Event [Line Items]            
Debt instrument, term   364 days 364 days      
Aggregate principal debt amount issued     $ 750,000,000.0      
Notes Payable | Closing Date Facility | Subsequent Event            
Subsequent Event [Line Items]            
Aggregate principal debt amount issued     500,000,000.0      
Notes Payable | Closing Date Facility, Series 1 | Subsequent Event            
Subsequent Event [Line Items]            
Proceeds from unsecured debt     391,000,000.0      
Notes Payable | Closing Date Facility, Series 2 | Subsequent Event            
Subsequent Event [Line Items]            
Proceeds from unsecured debt   € 100.0 109,800,000      
Notes Payable | Delayed Draw Facility | Subsequent Event            
Subsequent Event [Line Items]            
Aggregate principal debt amount issued     $ 250,000,000.0      
Forecast            
Subsequent Event [Line Items]            
Equity method investment, ownership percentage       20.00%    
Forecast | GIC | GIC, Singapore Sovereign Wealth Fund            
Subsequent Event [Line Items]            
Equity method investment, ownership percentage       80.00%