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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 | Dec. 31, 2021 | Jun. 30, 2020 | Jun. 30, 2019
Reconciliation of Deferred Revenue |  |  |  |
Deferred revenue - beginning balance | $ 32.8 | $ 32.7 | $ 2.2 | $ 2.6
Revenue recognized | (6.1) | (40.5) | (7.2) | (7.9)
Prepayments | 6.0 | 14.0 | 37.8 | 7.5
Divestitures | 0.0 | (1.0) | 0.0 | 0.0
Deferred revenue - ending balance | $ 32.7 | $ 5.2 | $ 32.8 | $ 2.2

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