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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 | [1] | $ 475.0 |  | $ 533.0 |
Other Investments | [2] | 209.3 |  | 221.3 |
Net investment income (1) |  | 275.7 | [3] | 188.1 | $ 147.5
Accrued expenses and other payables | [4] | 214.4 |  | 201.8 |
Realized and unrealized investment gains (2) |  | 75.9 |  | 5.0 | 56.2
Debt Securities, Trading | [5] | 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 |  | 2.1 |  | 4.5 |
Apollo real estate fund |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Realized and unrealized investment gains (2) |  | 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 |  | 23.9 |  | 25.3 |
Funds managed by Apollo | Fair Value, Recurring [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Other Investments |  | 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 |  |  |
[1] | Privately-held investments, trading at fair value include related party investments totaling $112.4 million (2022 — $44.8 million). Privately-held investments, available for sale include related party investments totaling $14.9 million (2022 — $Nil).
[2] | Other investments includes related party investments of $23.9 million (2022 — $25.3 million) in Apollo Real Estate Fund and $15.9 million (2022 — $12.7 million) in Apollo Origination Partnership.
[3] | Net investment income includes related party net investment income of $19.6 million (2022 — $3.1 million, 2021 — $Nil ) and related party investment management fees of $9.4 million (2022 — $4.9 million, 2021 — $5.8 million).
[4] | Includes amounts due to related parties of $2.1 million for investment management fees (2022 — $4.5 million), and $1.2 million for management consulting fees (2022 — $1.3 million).
[5] | Fixed income maturities, trading at fair value includes related party investments totaling $129.8 million (2022 — $Nil).

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