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Amount of increase (decrease) in allowance for credit loss on accounts receivable.

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Summary of Business and Significant Accounting Policies - Accounts Receivable and Allowances (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Jun. 30, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for bad debt expense					$ 6.1	$ 1.5
Bad debt expense	$ 2.0	$ 0.0	$ 5.0	$ 0.0
Allowance for cancellations					$ 20.3	$ 17.5
Deferred Revenue
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowances decrease	0.6	(5.0)	1.4	(16.5)
Revenue
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowances decrease	$ 1.3	$ (1.2)	$ 1.4	$ (3.5)