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Revenue - Reconciliation of Deferred Revenue Balances (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020
Reconciliation of Deferred Revenue |  |
Deferred revenues - beginning balance | $ 32.7 | $ 3.6
Revenue recognized | (30.3) | (8.4)
Prepayments | 10.1 | 37.1
Divestitures | (1.0) | 0.0
Deferred revenues - ending balance | $ 11.5 | $ 32.3

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