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Segment Reporting - Revenue Adjustments (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Segment Reporting Information [Line Items]    
Unrealized principal investment income (loss) $ 7.7 $ 315.3
Revenues 859.0 1,581.8
Reconciling Items    
Segment Reporting Information [Line Items]    
Unrealized performance and fee related performance revenues (20.7) 698.8
Unrealized principal investment income (loss) (29.0) 23.7
Adjustments related to expenses associated with investments in NGP Management and its affiliates (3.4) (3.1)
Tax expense associated with certain foreign performance revenues 0.0 (0.1)
Non-controlling interests and other adjustments to present certain costs on a net basis 50.8 17.9
Revenues (17.1) 740.6
Elimination of revenues of Consolidated Funds    
Segment Reporting Information [Line Items]    
Revenues $ (14.8) $ 3.4