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Revenue from Contracts with Customers (Tables) | 3 Months Ended
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Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Schedule of Financing Receivables, Minimum Payments [Table Text Block] | The table below represents the balances of our customer receivables and deferred revenues.
| December 31, |  | September 30,
| 2019 |  | 2019
| (in millions) |  |
Billed receivables | $ | 129.2 |  |  | $ | 171.0 |
Unbilled receivables | 5.2 |  |  | 4.5 |
Total customer receivables | $ | 134.4 |  |  | $ | 175.5 |
Deferred revenues | $ | 4.4 |  |  | $ | 4.7 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Tabular disclosure of the annual minimum payments due from financing receivables, such as, but not limited to accounts, notes, loans, and other financing receivables. + References No definition available. + Details
Name: | us-gaap_ScheduleOfFinancingReceivablesMinimumPaymentsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration