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Fair Value (Tables) | 3 Months Ended
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Dec. 31, 2023
Fair Value Disclosures [Abstract] |
Fair Value, by Balance Sheet Grouping [Table Text Block] |
Fair Value, by Balance Sheet Grouping [Table Text Block] |
|  |  | Fair Value at December 31, 2023
| Carrying Value |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
| (in millions)
Cash and cash equivalents (a) | $ | 458.9 |  |  | $ | 458.9 |  |  | $ | — |  |  | $ | — |  |  | $ | 458.9 |
Debt (b) (c) | 705.3 |  |  | — |  |  | 673.5 |  |  | 9.9 |  |  | 683.4 |
|  |  | Fair Value at September 30, 2023
| Carrying Value |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
| (in millions)
Cash and cash equivalents (a) | $ | 616.0 |  |  | $ | 616.0 |  |  | $ | — |  |  | $ | — |  |  | $ | 616.0 |
Debt (b) | 695.0 |  |  | — |  |  | 633.2 |  |  | — |  |  | 633.2 |

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- Definition Tabular disclosure of assets measured at fair value measured on a recurring or nonrecurring basis. Includes, but is not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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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 -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-11 + Details
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