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Related Party Transactions (Details) - Future of School - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Jun. 30, 2019
Related Party Transactions          
Contributions made to related party $ 0.2 $ 0.2 $ 1.2 $ 1.0  
Accrued contributions to related party $ 0.2   $ 0.2   $ 2.5