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Segment Reporting - Revenue Adjustments (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Nov. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]        
Revenues   $ 5,425.8 $ 2,963.9 $ 4,438.7
Reconciling Items        
Segment Reporting Information [Line Items]        
Unrealized performance and fee related performance revenues   1,031.9 (1,046.6) (142.5)
Unrealized principal investment income (loss)   34.1 36.1 (38.3)
Adjustments related to expenses associated with investments in NGP Management and its affiliates   (13.1) (13.8) (12.9)
Tax expense associated with certain foreign performance revenues   0.0 0.0 0.1
Non-controlling interests and other adjustments to present certain costs on a net basis   167.9 191.6 119.0
Revenues   1,138.8 (1,011.3) (273.7)
Consolidation, Eliminations        
Segment Reporting Information [Line Items]        
Revenues   (82.0) (74.6) (22.2)
Fortitude Holdings        
Segment Reporting Information [Line Items]        
Principal investment loss from dilution of indirect investment in Fortitude $ 7.9      
Fortitude Holdings | Reconciling Items        
Segment Reporting Information [Line Items]        
Principal investment loss from dilution of indirect investment in Fortitude   $ 0.0 $ (104.0) $ (176.9)