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Segment Reporting - Revenue Adjustments (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Segment Reporting Information [Line Items]    
Unrealized principal investment income $ 315.3 $ 176.2
Revenues 1,581.8 2,437.2
Reconciling Items    
Segment Reporting Information [Line Items]    
Unrealized performance and fee related performance revenues 698.8 1,621.8
Unrealized principal investment income 23.7 131.3
Adjustments related to expenses associated with investments in NGP Management and its affiliates (3.1) (3.6)
Tax expense associated with certain foreign performance revenues (0.1) (0.1)
Non-controlling interests and other adjustments to present certain costs on a net basis 17.9 45.3
Revenues 740.6 1,763.6
Elimination of revenues of Consolidated Funds    
Segment Reporting Information [Line Items]    
Revenues $ 3.4 $ (31.1)