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Investments - Investments (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Investments [Abstract]    
Accrued performance allocations $ 6,209.2 $ 7,117.7
Principal equity method investments, excluding performance allocations 3,008.3 2,922.0
Principal investments in CLOs 524.7 526.1
Other investments 232.5 202.1
Total $ 9,974.7 $ 10,767.9