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Common Stock (Details) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended 231 Months Ended
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Equity, Class of Treasury Stock [Line Items]            
Common stock, outstanding (in shares) 54,755,900 54,755,900 54,755,900   54,755,900 56,219,831
Dividend paid (in dollars per share)   $ 0.08        
Increase in quarterly dividend (in dollars per share) $ 0.13          
Stock repurchase, authorized amount (in US dollars) $ 1,150,000,000 $ 1,150,000,000 $ 1,150,000,000   $ 1,150,000,000  
Number of shares repurchased (in shares)     1,700,000   17,500,000  
Stock repurchased (in US dollars)     $ 112,553,000 $ 216,244,000 $ 904,000,000.0  
Remaining authorized repurchase amount (in US dollars) $ 246,000,000.0 $ 246,000,000.0 $ 246,000,000.0   $ 246,000,000.0