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Long-term and Short-term Debt - Schedule of Long-term Debt (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Sep. 30, 2023
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Long-term debt |  |
Unamortized discount, capitalized lease obligations and other | $ (33.2) | $ (34.9)
Total debt | 2,868.7 | 2,871.5
Less: Current portion | (307.4) | (8.6)
Long-term debt | $ 2,561.3 | 2,862.9
2.875% notes, payable in March 2025 |  |
Long-term debt |  |
Stated interest rate (in percent) | 2.875% |
Debt instruments | $ 301.9 | 306.4
6.70% debentures, payable in January 2028 |  |
Long-term debt |  |
Stated interest rate (in percent) | 6.70% |
Debt instruments | $ 250.0 | 250.0
3.50% notes, payable in March 2029 |  |
Long-term debt |  |
Stated interest rate (in percent) | 3.50% |
Debt instruments | $ 425.0 | 425.0
1.75% notes, payable in August 2031 |  |
Long-term debt |  |
Stated interest rate (in percent) | 1.75% |
Debt instruments | $ 450.0 | 450.0
6.25% debentures, payable in December 2037 |  |
Long-term debt |  |
Stated interest rate (in percent) | 6.25% |
Debt instruments | $ 250.0 | 250.0
4.20% notes, payable in March 2049 |  |
Long-term debt |  |
Stated interest rate (in percent) | 4.20% |
Debt instruments | $ 575.0 | 575.0
2.80% notes, payable in August 2061 |  |
Long-term debt |  |
Stated interest rate (in percent) | 2.80% |
Debt instruments | $ 450.0 | 450.0
5.20% debentures, payable in January 2098 |  |
Long-term debt |  |
Stated interest rate (in percent) | 5.20% |
Debt instruments | $ 200.0 | $ 200.0

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-4 + Details
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