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Commitments and Contingencies - Schedule of Company's Restricted Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Apr. 01, 2022
Sep. 30, 2021
Dec. 20, 2017
Fair Value, Separate Account Investment [Line Items]          
Restricted Assets $ 471.3 $ 539.8      
Restricted assets, excluding illiquid assets 3,996.1 4,530.8      
Other investments, at fair value (2) [1] 221.3 151.3      
Total restricted assets $ 4,217.4 $ 4,682.1      
Total as percent of investable assets 59.40% 59.70%      
Securities and cash as collateral secured letters of credit $ 471.3 $ 539.8      
Affiliated transactions          
Fair Value, Separate Account Investment [Line Items]          
Restricted Assets 707.1 891.3      
Third party          
Fair Value, Separate Account Investment [Line Items]          
Restricted Assets 2,817.7 3,099.7      
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) $ 221.3 $ 151.3      
[1] Other investments includes related party investments of $25.3 million in Apollo Real Estate Fund and $12.7 million in Apollo Origination Partnership. (3)    Cash and cash equivalents includes restricted cash of $232.1 million (2021 — $364.9 million) which are held in trusts.