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Commitments and Contingencies - Tax Matters - Sales and use tax (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2020	Sep. 30, 2020
Gain Contingencies [Line Items]
Net benefit recorded from sales and use tax audit		$ 12.4
Sales and use tax refund	$ 17.3
Accrued liability related to sales and use tax audit settlement	$ 2.0
Cost of sales excluding depreciation and amortization
Gain Contingencies [Line Items]
Net benefit recorded from sales and use tax audit		4.4
SG&A
Gain Contingencies [Line Items]
Net benefit recorded from sales and use tax audit		$ 7.9