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Related Party Disclosures - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Management and advisory fees, net | StepStone Funds
Related Party Transaction [Line Items]
Revenue from related parties	$ 45.9	$ 37.3
Carried interest allocation revenues | StepStone Funds
Related Party Transaction [Line Items]
Revenue from related parties	226.4	$ (128.5)
Tax Receivable Agreement | Non-controlling interest holders
Related Party Transaction [Line Items]
Expenses to related parties	$ 0.6

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Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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