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Commitments and Contingencies - Schedule of Company's Restricted Assets (Details) - USD ($) $ in Millions | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022 | Apr. 01, 2022 | Sep. 30, 2021 | Dec. 20, 2017
Fair Value, Separate Account Investment [Line Items] |  |  |  |  |  |  |
Restricted Assets |  | $ 266.5 |  | $ 471.3 |  |  |
Restricted assets, excluding illiquid assets |  | 3,657.3 |  | 3,996.1 |  |  |
Other investments, at fair value (2) | [1] | 213.4 |  | 221.3 |  |  |
Total restricted assets |  | $ 3,870.7 |  | 4,217.4 |  |  |
Total as percent of investable assets |  | 52.60% | 59.40% |  |  |  |
Securities and cash as collateral secured letters of credit |  | $ 266.5 |  | 471.3 |  |  |
Affiliated transactions |  |  |  |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |  |  |  |
Restricted Assets |  | 617.0 |  | 707.1 |  |  |
Third party |  |  |  |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |  |  |  |
Restricted Assets |  | 2,773.8 |  | 2,817.7 |  |  |
Limited Partner | Real estate fund |  |  |  |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |  |  |  |
Restricted Assets |  |  |  |  | $ 10.0 | $ 20.0 | $ 100.0
Other investments, at fair value (2) |  | $ 213.4 |  | $ 221.3 |  |  |
[1] | Other investments includes related party investments of $22.9 million (December 31, 2022 — $25.3 million) in Apollo Real Estate Fund and $12.6 million (December 31, 2022 — $12.7 million) in Apollo Origination Partnership. (3) Cash and cash equivalents includes restricted cash of $312.1 million (December 31, 2022 — $232.1 million ) which are held in trusts. (4)

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