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Investments - Schedule of Income (Loss) from Principal Investments (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
NGP Management          
Schedule of Investments [Line Items]          
Reduction in accrued performance allocations   $ 38.0      
Net investment earnings (losses) related to performance allocations $ 27.6   $ 3.0 $ (0.9) $ 18.3
Principal investment income (loss) from equity method investments (excluding performance allocations)          
Schedule of Investments [Line Items]          
Principal investment income from equity method investments 55.4   56.5 (7.3) 103.6
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 43.2   37.3 (52.4) 66.1
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 (0.5)   19.6 18.7 31.0
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 $ 12.7   $ (0.4) $ 26.4 $ 6.5