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Commitments and Contingencies - Narrative (Details) - USD ($) |  |  |  | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 02, 2020 | Sep. 16, 2020 | Aug. 06, 2020 | Mar. 31, 2021 | Dec. 31, 2020 | Jan. 01, 2019 | Dec. 31, 2018 | Feb. 28, 2015
Arcadian Risk Capital Ltd [Member] |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Notes Receivable, Maximum Commitment |  | $ 18,000,000.0 |  |  |  |  |  |
Notes Receivable, Interest Rate |  | 8.00% |  |  |  |  |  |
Forecast | Series B Preferred Stock [Member] |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  | 8.00% |  |  |  |
Forecast | Series B Preferences Share Conversion To New Preference Shares [Member] | Series B Preferred Stock [Member] |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Conversion of Stock, Amount Issued |  |  |  | $ 260,000,000.0 |  |  |  |
Forecast | Series B Preferences Share Conversion To partial Cash [Member] |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Payments For Cash Conversion Of Preferred Stock |  |  |  | 60,000,000.0 |  |  |  |
Forecast | Series B Preferences Share Conversion To All Cash [Member] |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Payments For Cash Conversion Of Preferred Stock |  |  |  | $ 260.0 |  |  |  |
TP Fund |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Annual investment management fee |  |  |  |  |  | 1.25% | 1.50% |
Equity Commitment Letter [Member] | Affiliated Entity [Member] |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Related Party Transaction, Shares Purchased, Percentage |  |  | 9.50% |  |  |  |  |
Related Party Transaction, Shares Purchased, Value |  |  | $ 50,000,000.0 |  |  |  |  |
Bridge Loan [Member] |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Maximum Borrowing Capacity |  |  | $ 125,000,000.0 |  |  |  |  |
7% Senior Unsecured Notes | Unsecured Debt |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Debt issued |  |  |  |  | $ 115,000,000.0 |  |  | $ 115,000,000.0
Interest rate |  |  |  |  | 7.00% |  |  | 7.00%
Unsecured Revolving Credit Facility [Member] | Unsecured Debt |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Debt issued | $ 300,000,000.0 |  |  |  |  |  |  |
Term of debt | 3 years |  |  |  |  |  |  |
Extension option term | 12 months |  |  |  |  |  |  |
Unsecured Revolving Credit Facility [Member] | Unsecured Debt | Minimum |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Fee on undrawn commitments | 0.20% |  |  |  |  |  |  |
Unsecured Revolving Credit Facility [Member] | Unsecured Debt | Minimum | Adjusted LIBOR |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.25% |  |  |  |  |  |  |
Unsecured Revolving Credit Facility [Member] | Unsecured Debt | Minimum | Base Rate |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 0.25% |  |  |  |  |  |  |
Unsecured Revolving Credit Facility [Member] | Unsecured Debt | Maximum |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Fee on undrawn commitments | 0.40% |  |  |  |  |  |  |
Unsecured Revolving Credit Facility [Member] | Unsecured Debt | Maximum | Adjusted LIBOR |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 2.25% |  |  |  |  |  |  |
Unsecured Revolving Credit Facility [Member] | Unsecured Debt | Maximum | Base Rate |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.25% |  |  |  |  |  |  |

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