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Revenue - Reconciliation of Deferred Revenue Balances (Details) - USD ($) $ in Millions	9 Months Ended
	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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- Definition

Contract With Customer, Liability, Divestitures

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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
-URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130531-203044

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-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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