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Related Party Transactions (Details) - Future of School - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Jun. 30, 2019
Related Party Transactions          
Contributions made to related party $ 0.3 $ 0.4 $ 1.0 $ 0.8  
Accrued contributions to related party $ 0.4   $ 0.4   $ 2.5