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Acquisition of Tokio Millennium Re (Overview) (Details) - TMR - USD ($) $ in Thousands |  | 12 Months Ended
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Mar. 22, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Business Acquisition [Line Items] |  |  |
Total purchase price | $ 1,563,593 |  |
Corporate expenses associated with the acquisition |  | $ 9,100 | $ 49,700

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