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Common Stock (Details) - USD ($)
 3 Months Ended 9 Months Ended 228 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Dec. 31, 2019
Equity, Class of Treasury Stock [Line Items]            
Common stock, outstanding 54,922,620   54,922,620   54,922,620 56,219,831
Common stock, issued 24,694 18,651 186,544 164,112    
Common stock, dividend, per share     $ 0.08      
Number of shares repurchased     1,500,000   17,400,000  
Stock repurchased (in US dollars)     $ 99,048,000   $ 890,500,000  
Remaining authorized repurchase amount (in US dollars) $ 259,500,000   259,500,000   259,500,000  
RepurchaseProgramSep2011toSep2020            
Equity, Class of Treasury Stock [Line Items]            
Stock repurchase, authorized amount (in US dollars) $ 1,150,000,000   $ 1,150,000,000   $ 1,150,000,000