Segment Reporting - Revenue Adjustments (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Segment Reporting Information [Line Items]
Total revenues	$ 254.0	$ 973.1
Reconciling Items
Segment Reporting Information [Line Items]
Unrealized performance and fee related performance revenues	(669.4)	(197.3)
Unrealized principal investment income (loss)	(68.3)	17.0
Adjustments related to expenses associated with investments in NGP Management and its affiliates	(11.6)	(96.1)
Non-controlling interests and other adjustments to present certain costs on a net basis	24.0	91.0
Total revenues	(676.6)	(203.5)
Elimination of revenues of Consolidated Funds
Segment Reporting Information [Line Items]
Total revenues	$ 48.7	$ (18.1)

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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+ Details