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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 |

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