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v3.21.1

Common Stock (Details) - USD ($) | 3 Months Ended | 234 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Dec. 31, 2020
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Common stock, outstanding | 54,729,679 |  | 54,729,679 | 54,755,900
Common stock, issued | 91,243 | 101,695 |  |
Common stock, dividend, per share | $ 0.13 |  |  |
Number of shares repurchased | 100,000 |  | 17,700,000 |
Stock repurchased (in US dollars) | $ 12,917,000 | $ 99,048,000 | $ 917,000,000.0 |
Remaining authorized repurchase amount (in US dollars) | 233,000,000.0 |  | 233,000,000.0 |
RepurchaseProgramSep2011toMar2021 |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Stock repurchase, authorized amount (in US dollars) | $ 1,150,000,000 |  | $ 1,150,000,000 |

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