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Fair Value Measurements (Tables) | 3 Months Ended
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Dec. 31, 2021
Fair Value Disclosures [Abstract] |
Carrying Value and Estimated Fair Value of Long-term Debt, Including Current Maturities | The carrying value and estimated fair value of our long-term debt, including current maturities, were as follows (in millions):
|  | December 31, 2021 |  |  | September 30, 2021 |
|  | Carrying |  |  | Fair |  |  | Carrying |  |  | Fair |
|  | Value |  |  | Value |  |  | Value |  |  | Value |
Long-term debt and finance leases, including current maturities(1) |  | $ | 678.6 |  |  | $ | 674.0 |  |  | $ | 670.3 |  |  | $ | 676.8 |
(1) | Current and prior period long-term debts' carrying and fair values exclude net debt issuance costs.

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