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Investments - Investments (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Investments [Abstract]    
Accrued performance allocations $ 5,567.6 $ 6,169.9
Principal equity method investments, excluding performance allocations 3,145.4 3,024.1
Principal investments in CLOs 520.8 532.6
Other investments 239.4 228.7
Total $ 9,473.2 $ 9,955.3