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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)