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Borrowings - Summary of Notes Payable to Related Parties (Detail) - USD ($) $ in Millions | Jun. 30, 2021 | Jun. 30, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Notes payable to related parties | $ 1,170.5 | $ 987.1
Shareholder Notes |  |
Debt Instrument [Line Items] |  |
Notes payable to related parties | 1,166.8 | 983.7
Management Notes |  |
Debt Instrument [Line Items] |  |
Notes payable to related parties | $ 3.7 | $ 3.4

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