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Related Party Transactions - Narrative (Details) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Plus component of annual investment management fee |  |  | 0.250 |  | 0.25 |  |
Annual fee cap |  |  | 0.15 |  | 15 |  |
Privately-held Investments, trading | $ 341.2 |  | $ 341.2 |  | $ 475.0 | $ 533.0 |
Other investments, at fair value | 204.7 |  | 204.7 |  | 209.3 | 221.3 |
Net investment income | 79.6 | $ 77.9 | 238.9 | $ 207.3 | 275.7 | 188.1 | $ 147.5
Accrued expenses and other payables | 248.4 |  | 248.4 |  | 214.4 | 201.8 |
Realized and unrealized investment gains (losses) | 22.0 | 11.3 | 48.8 | 47.4 | 75.9 | 5.0 | 56.2
Fixed income securities, trading at fair value | 1,281.3 |  | 1,281.3 |  | 1,485.7 | 1,475.5 |
Other expenses |  |  |  |  | 0.0 | 20.1 | 10.8
General and administrative expenses | 99.4 | 87.3 | 297.5 | 256.3 | 354.5 | 386.5 | 333.1
Asset Management Arrangement |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Net investment income |  |  |  |  | 9.4 | 4.9 | 5.8
Accrued expenses and other payables |  |  |  |  | 2.1 | 4.5 |
Management Consulting Agreement |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
General and administrative expenses |  |  |  |  | 5.0 | 5.0 | $ 5.0
Apollo Real Estate Fund |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Realized and unrealized investment gains (losses) | 0.0 | 0.2 | 0.1 | 0.6 | 0.4 | 3.1 |
Beneficial owner |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Accounts payable, current | 1.2 |  | 1.2 |  | 1.2 | 2.0 |
Apollo Real Estate Fund | Fair Value, Recurring [Member] |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Other investments, at fair value | 20.1 |  | 20.1 |  | 23.9 | 25.3 |
Funds managed by Apollo | Fair Value, Recurring [Member] |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Other investments, at fair value | 38.5 |  | 38.5 |  | 39.8 | 38.0 |
Apollo Notes, SPV |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Privately-held investment, losses incurred | 1.6 | 1.3 | 4.2 | 3.7 | 5.5 | (0.4) |
Apollo Notes, SPV | Fair Value, Recurring [Member] |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Privately-held Investments, trading | 68.3 |  | 68.3 |  | 82.2 | 44.8 |
CLOs |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Net investment income | 1.0 | 4.6 | 9.6 | 13.8 | 17.4 | 0.0 |
Other expenses |  |  |  |  | 0.5 |  |
CLOs | Fair Value, Recurring [Member] |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Fixed income securities, trading at fair value |  |  |  |  | 129.8 | 0.0 |
Middle Market Term Loans managed by a subsidiary of Apollo |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Net investment income |  | $ 0.4 | 0.6 | $ 2.5 | 5.8 | 0.0 |
Realized and unrealized investment gains (losses) | (1.6) |  |  |  |  |  |
Other expenses |  |  |  |  | 0.2 |  |
Middle Market Term Loans managed by a subsidiary of Apollo | Fair Value, Recurring [Member] |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Fixed income securities, trading at fair value | 7.1 |  | $ 7.1 |  | 45.1 | 0.0 |
Management Consulting Agreement |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Accrued expenses and other payables |  |  |  |  | $ 1.2 | $ 1.3 |
Maximum |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Percentage of consolidated group's net income due to Apollo Management |  |  | 1.00% |  | 1.00% |  |
Dollar amount option to percentage fee | $ 5.0 |  | $ 5.0 |  | $ 5.0 |  |

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