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Organization and Summary of Significant Accounting Policies - Reconciliation of Deferred Revenue (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Dec. 31, 2020
Jun. 30, 2020
Jun. 30, 2019
Reconciliation of Deferred Revenue      
Deferred revenue - beginning balance $ 32.8 $ 2.2 $ 2.6
Revenue recognized (6.1) (7.2) (7.9)
Prepayments 6.0 37.8 7.5
Deferred revenue - ending balance $ 32.7 $ 32.8 $ 2.2