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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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