Summary of Significant Accounting Policies Improving the Presentation of Net Periodic Pension Cost (Details) - USD ($) $ in Millions |
9 Months Ended | |
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Jun. 30, 2020 |
Jun. 30, 2019 |
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| New Accounting Pronouncements or Change in Accounting Principle [Line Items] | ||
| 2017 Periodic Pension Cost Restatement | $ 0.0 | $ (0.2) |
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- Definition Represents the quantification of the effect of adopting the new accounting standard or change in accounting principle expected by the entity to have a significant effect on the entity's financial statements. No definition available.
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| X | ||||||||||
- 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. No definition available.
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