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Segment and Related Information - Revenue by Geographical Region (Details) - USD ($) $ in Millions	3 Months Ended										6 Months Ended		12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2020	Dec. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Total revenue	$ 154.6	$ 145.2	$ 93.2	$ 164.0	$ 195.1	$ 186.3	$ 215.4	$ 216.6	$ 216.8	$ 202.3	$ 299.8	$ 381.4	$ 638.6	$ 851.1	$ 743.7
United States
Segment Reporting Information [Line Items]
Total revenue											275.4		596.2	805.4	700.5
Rest of world
Segment Reporting Information [Line Items]
Total revenue											$ 24.4		$ 42.4	$ 45.7	$ 43.2

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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