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Investments - Additional Information (Narrative) (Details) | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |
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Mar. 31, 2021 USD ($) | Dec. 31, 2023 USD ($) security | Dec. 31, 2022 USD ($) security | Dec. 31, 2021 USD ($) | Aug. 31, 2023 USD ($) | Apr. 01, 2023 USD ($) | May 05, 2022 USD ($) | Apr. 01, 2022 USD ($) | Sep. 30, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 23, 2019 USD ($) | Dec. 20, 2017 USD ($) | Jan. 01, 2017 USD ($)
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Catastrophe bonds, trading, cost |  | $ 1,600,000 | $ 2,900,000 |  |  |  |  |  |  |  |  |  |
Investment in the period |  | 400,000 | 2,000,000.0 |  |  |  |  |  |  |  |  |  |
Equity method investment, aggregate cost |  | 7,600,000 | 6,200,000 | $ 3,900,000 |  |  |  |  |  |  |  |  |
Other investments, at fair value (2) |  | 209,300,000 | 221,300,000 |  |  |  |  |  |  |  |  |  |
Investment in Multiline reinsurer |  | 0 | 0 |  |  |  |  |  |  |  |  |  |
Investment funded |  | 0 |  |  |  |  |  |  |  |  |  |  |
Available-for-sale investment, allowance for credit loss, increase (decrease) |  | $ (3,600,000) | $ 200,000 |  |  |  |  |  |  |  |  |  |
Number of Securities | security |  | 950 | 1,166 |  |  |  |  |  |  |  |  |  |
Available-for-sale securities, unrealized loss position |  | $ 221,800,000 | $ 339,000,000.0 |  |  |  |  |  |  |  |  |  |
External Credit Rating, Non Investment Grade |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities, unrealized loss position |  | 1,200,000 |  |  |  |  |  |  |  |  |  |  |
Investment, Identifier [Axis]: Unfunded Commitment, Apollo Real Estate Fund |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Unfunded commitment |  | 4,100,000 |  |  |  |  |  |  |  |  |  |  |
Investment, Identifier [Axis]: Unfunded Commitment, Infrastructure fund |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Unfunded commitment |  | 4,000,000 |  |  |  |  |  |  |  |  |  |  |
Investment, Identifier [Axis]: Unfunded Commitment, Managed Debt Fund |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Unfunded commitment |  | 6,900,000 |  |  |  |  |  |  |  |  |  |  |
Investment, Identifier [Axis]: Unfunded Commitment, Managed lending fund |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Unfunded commitment |  | 1,100,000 |  |  |  |  |  |  |  |  |  |  |
Investment, Identifier [Axis]: Unfunded Commitment, Real Estate Fund (Sept 2021) |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Unfunded commitment |  | 2,200,000 |  |  |  |  |  |  |  |  |  |  |
Fair Value, Recurring [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, fair value |  | 117,100,000 | 134,600,000 |  |  |  |  |  |  |  |  |  |
Fair Value, Recurring [Member] | Apollo real estate fund |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Other investments, at fair value (2) |  | 23,900,000 | 25,300,000 |  |  |  |  |  |  |  |  |  |
Real estate fund | Fair Value, Recurring [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, fair value |  | 209,300,000 | 221,300,000 |  |  |  |  |  |  |  |  |  |
Commercial mortgage loans |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair market value, trading |  | 274,900,000 | 312,100,000 |  |  |  |  |  |  |  |  |  |
Middle market loans |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair market value, trading |  | 84,800,000 | 106,900,000 |  |  |  |  |  |  |  |  |  |
Privately-held investments |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair market value, trading |  | 475,000,000.0 | 533,000,000.0 |  |  |  |  |  |  |  |  |  |
Real estate fund (Sept 2021) | Fair Value, Recurring [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, fair value |  | 39,800,000 | 40,600,000 |  |  |  |  |  |  |  |  |  |
Infrastructure fund | Fair Value, Recurring [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, fair value |  | 10,800,000 | 8,200,000 |  |  |  |  |  |  |  |  |  |
Managed Lending Fund (Dec 2020) | Fair Value, Recurring [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, fair value |  | 15,900,000 | 12,700,000 |  |  |  |  |  |  |  |  |  |
Pledge Accounts, Custodian Bank (April 2021) | Fair Value, Recurring [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, fair value |  | 1,700,000 | 1,300,000 |  |  |  |  |  |  |  |  |  |
Managed debt fund | Fair Value, Recurring [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, fair value |  | 100,000 | 0 |  |  |  |  |  |  |  |  |  |
MVI |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in the period | $ 800,000 | 0 | 400,000 |  |  |  |  |  |  |  |  |  |
Equity method investment, aggregate cost |  | 1,000,000.0 | 800,000 | 500,000 |  |  |  |  |  |  |  |  |
Gross realized and unrealized gains (loss) |  | 200,000 | 0 | 100,000 |  |  |  |  |  |  |  |  |
Investment in Multiline reinsurer |  | 0 | 0 |  |  |  |  |  |  |  |  |  |
Digital Re |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in the period |  | 0 | 0 |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  | 49.00%
Equity method investment, aggregate cost |  | 200,000 | 200,000 | 200,000 |  |  |  |  |  |  |  |  | $ 2,300,000
Investment in Multiline reinsurer |  | 0 | 0 |  |  |  |  |  |  |  |  |  |
Multi-Line Insurer |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in the period |  | 400,000 | 1,600,000 |  |  |  |  |  |  |  |  |  |
Equity method investment, aggregate cost |  | 6,400,000 | 5,200,000 | 3,200,000 |  |  |  |  |  |  |  |  |
Other investments, at fair value (2) |  |  |  |  |  |  |  |  |  |  | $ 5,000,000 |  |
Gross realized and unrealized gains (loss) |  | 800,000 | (400,000) | $ 200,000 |  |  |  |  |  |  |  |  |
Investment in Multiline reinsurer |  | $ 0 | $ 0 |  |  |  |  |  |  |  |  |  |
Limited Partner |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted assets |  |  |  |  |  |  |  | $ 10,000,000 | $ 20,000,000 |  |  | $ 100,000,000 |
Limited Partner | Real estate fund | Apollo real estate fund |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted assets |  |  |  |  |  |  |  | $ 30,000,000 |  |  |  |  |
Limited Partner | Infrastructure fund |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted assets |  |  |  |  |  |  | $ 15,000,000 |  |  |  |  |  |
Limited Partner | Managed lending fund |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted assets |  |  |  |  |  | $ 2,800,000 |  |  |  | $ 10,500,000 |  |  |
Limited Partner | Managed debt fund |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted assets |  |  |  |  | $ 7,000,000 |  |  |  |  |  |  |  |

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- Definition Amount of increase (decrease) in allowance for credit loss of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-9 + Details
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