Long-term and Short-term Debt - Schedule of Carrying Amounts and Estimated Fair Values (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Carrying Value
Current portion of long-term debt	$ 8.6	$ 609.1
Carrying Value
Carrying Value
Current portion of long-term debt	8.6	609.1
Long-term debt	2,862.9	2,867.8
Fair Value
Fair Value
Current portion of long-term debt	8.6	589.1
Long-term debt	$ 2,442.6	$ 2,485.4

Long-term Debt, Current Maturities, Fair Value

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- References

No definition available.

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- References

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- Definition

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt classified as current. Excludes lease obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(20))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

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- Definition

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt classified as noncurrent. Excludes lease obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

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