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Commitments and Contingencies - Future Minimum Lease Payments (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Commitments and Contingencies Disclosure [Abstract]      
Lease Expense Under Rental $ 20.2 $ 22.6 $ 26.6