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Related Party Disclosures - Narrative (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Management and advisory fees, net | StepStone Funds
Related Party Transaction [Line Items]
Revenue from related parties		$ 51.0	$ 47.8	$ 96.9	$ 85.1
Carried interest allocation revenues | StepStone Funds
Related Party Transaction [Line Items]
Revenue from related parties		196.4	$ 166.1	422.7	$ 37.6
Tax Receivable Agreement | Affiliated Entity
Related Party Transaction [Line Items]
Expenses to related parties		0.0		0.6
Legacy Greenspring carried interest allocations | StepStone Funds
Related Party Transaction [Line Items]
Revenue from related parties	$ 3.0	$ 0.0		$ 0.0

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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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