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Revenue - Reconciliation of Deferred Revenue Balances (Details) - USD ($) $ in Millions	6 Months Ended
	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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- Definition

Contract With Customer, Liability, Held For Sale Reclassification

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- Definition

Contract With Customer, Liability, Including New Contract, Revenue Recognized

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- Definition

Contract with customer, liability, prepayments.

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- References

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- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
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-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Section 50
-Paragraph 8
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