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Investments - Schedule of Income (Loss) from Principal Investments (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
NGP Management          
Schedule of Investments [Line Items]          
Impairment charge       $ 92.5  
Reduction in accrued performance allocations   $ 38.0   38.0  
Net investment earnings (losses) related to performance allocations $ 23.8   $ 14.9 22.9 $ 33.2
Principal investment income (loss) from equity method investments (excluding performance allocations)          
Schedule of Investments [Line Items]          
Principal investment income from equity method investments 68.0   103.5 60.7 207.1
Global Private Equity | Principal investment income (loss) from equity method investments (excluding performance allocations)          
Schedule of Investments [Line Items]          
Principal investment income from equity method investments 39.4   58.0 (13.0) 124.1
Global Credit | Principal investment income (loss) from equity method investments (excluding performance allocations)          
Schedule of Investments [Line Items]          
Principal investment income from equity method investments 12.8   30.5 31.5 61.5
Carlyle AlpInvest | Principal investment income (loss) from equity method investments (excluding performance allocations)          
Schedule of Investments [Line Items]          
Principal investment income from equity method investments $ 15.8   $ 15.0 $ 42.2 $ 21.5