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Commitments and Contingencies - Tax Matters - Sales and use tax (Details) - USD ($) $ in Millions | 3 Months Ended
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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

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- Definition Accrued liability related to sales and use tax audit settlement. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Amount of cash refund received related to settlement of sales and use tax audit. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Amount of expense (benefit) adjustment due to settlement of sales and use tax audits. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Balance Type: |
Period Type: |