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Segment Reporting - Revenue Adjustments (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Segment Reporting Information [Line Items]    
Total revenues $ 688.4 $ 859.0
Reconciling Items    
Segment Reporting Information [Line Items]    
Unrealized performance and fee related performance revenues (521.6) (20.7)
Unrealized principal investment income (loss) 4.4 (29.0)
Adjustments related to expenses associated with investments in NGP Management and its affiliates (3.2) (3.4)
Non-controlling interests and other adjustments to present certain costs on a net basis 41.5 50.8
Total revenues (499.5) (17.1)
Elimination of revenues of Consolidated Funds    
Segment Reporting Information [Line Items]    
Total revenues $ (20.6) $ (14.8)