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Fair Value Measures and Disclosures (Tables) | 6 Months Ended
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Mar. 31, 2021
Fair Value Disclosures [Abstract] |
Fair Value Measurements, Not Measured at Fair Value | For the financial assets and liabilities that the Company does not reflect at fair value, the following tables present both their respective carrying value and fair value at March 31, 2021 and September 30, 2020.
|  |  | Fair Value at March 31, 2021
| Carrying Value |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
| (in millions)
Cash and cash equivalents (1) | $ | 167.2 |  |  | $ | 167.2 |  |  | $ | — |  |  | $ | — |  |  | $ | 167.2 |
Debt (2) (3) | 654.6 |  |  | — |  |  | 676.3 |  |  | 12.5 |  |  | 688.8 |
|  |  | Fair Value at September 30, 2020
| Carrying Value |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
| (in millions)
Cash and cash equivalents (1) | $ | 394.3 |  |  | $ | 394.3 |  |  | $ | — |  |  | $ | — |  |  | $ | 394.3 |
Debt (2) | 641.1 |  |  | — |  |  | 673.5 |  |  | — |  |  | 673.5 |
__________________ (1)The fair values of cash and cash equivalents approximate their carrying values due to their short-term nature and are classified as Level 1 within the fair value hierarchy. (2)At March 31, 2021 and September 30, 2020, the Company's debt primarily consisted of its senior notes. The fair value of the senior notes is determined based on quoted market prices, which is classified as Level 2 within the fair value hierarchy. (3)The fair value of the Company's other note payable approximates its carrying value due to its short-term nature and is classified as Level 3 within the fair value hierarchy.

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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