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Fair Value Measurements - Schedule of Financial Instruments not Measured at Fair Value (Details) - USD ($) $ in Millions	Jun. 30, 2025	Sep. 30, 2024
Financial Assets [Abstract]
Other investments	$ 381.9	$ 280.7
Financial Liability [Abstract]
Debt	2,666.7	2,780.3
Carrying Value [Member]
Financial Assets [Abstract]
Cash and cash equivalents	3,253.9	3,309.5
Time deposits	9.1	9.8
Financial Liability [Abstract]
Debt	2,666.7	2,780.3
Estimated Fair Value [Member] | Level 1 [Member]
Financial Assets [Abstract]
Cash and cash equivalents	3,253.9	3,309.5
Estimated Fair Value [Member] | Level 2 [Member]
Financial Assets [Abstract]
Time deposits	9.1	9.8
Financial Liability [Abstract]
Debt	2,247.2	2,387.0
Equity securities [Member] | Carrying Value [Member]
Financial Assets [Abstract]
Other investments	372.8	270.9
Equity securities [Member] | Estimated Fair Value [Member] | Level 3 [Member]
Financial Assets [Abstract]
Other investments	$ 372.8	$ 270.9

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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

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Amount of investments classified as other.

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