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Related Party Transactions - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Related Party Transaction [Line Items] |  |  |
Plus component of annual investment management fee | 0.25 |  |
Annual fee cap | 0.15 |  |
Privately-held Investments | $ 475.0 | $ 533.0 |
Other investments, at fair value (2) | 209.3 | 221.3 |
Net investment income (1) | 275.7 | 188.1 | $ 147.5
Accrued expenses and other payables (4) | 214.4 | 201.8 |
Realized and unrealized investment gains | 75.9 | 5.0 | 56.2
Debt Securities, Trading | 1,485.7 | 1,475.5 |
Other expenses | 0.0 | 20.1 | 10.8
Asset Management Arrangement |  |  |
Related Party Transaction [Line Items] |  |  |
Net investment income (1) | 9.4 | 4.9 | $ 5.8
Accrued expenses and other payables (4) | 2.1 | 4.5 |
Apollo real estate fund |  |  |
Related Party Transaction [Line Items] |  |  |
Realized and unrealized investment gains | 0.4 | 3.1 |
Beneficial owner |  |  |
Related Party Transaction [Line Items] |  |  |
Accounts Payable, Current | 1.2 | 2.0 |
Apollo real estate fund | Fair Value, Recurring [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Other investments, at fair value (2) | 23.9 | 25.3 |
Funds managed by Apollo | Fair Value, Recurring [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Other investments, at fair value (2) | 39.8 | 38.0 |
Apollo Notes, SPV |  |  |
Related Party Transaction [Line Items] |  |  |
Privately-held investment, losses incurred | 5.5 | (0.4) |
Apollo Notes, SPV | Fair Value, Recurring [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Privately-held Investments | 82.2 | 44.8 |
CLOs |  |  |
Related Party Transaction [Line Items] |  |  |
Net investment income (1) | 17.4 | 0.0 |
Other expenses | 0.5 |  |
CLOs | Fair Value, Recurring [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Debt Securities, Trading | 129.8 | 0.0 |
Middle Market Term Loans managed by a subsidiary of Apollo |  |  |
Related Party Transaction [Line Items] |  |  |
Net investment income (1) | 5.8 | 0.0 |
Other expenses | 0.2 |  |
Middle Market Term Loans managed by a subsidiary of Apollo | Fair Value, Recurring [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Debt Securities, Trading | $ 45.1 | $ 0.0 |
Maximum |  |  |
Related Party Transaction [Line Items] |  |  |
Percentage of consolidated group's net income due to Apollo Management | 1.00% |  |
Dollar amount option to percentage fee | $ 5.0 |  |

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