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Revenue - Reconciliation of Deferred Revenue Balances (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
Reconciliation of Deferred Revenue |  |
Deferred revenue - beginning balance | $ 32.7 | $ 3.6
Revenue recognized | (15.5) | (6.1)
Prepayments | 6.3 | 35.3
Held for sale reclassification | (0.9) | 0.0
Deferred revenue - ending balance | $ 22.6 | $ 32.8

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