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Fair Value Measurements - Financial Instruments not Measured at Fair Value (Details) - USD ($) $ in Millions	Sep. 30, 2025	Sep. 30, 2024
Financial Assets [Abstract]
Other investments	$ 300.6	$ 280.7
Debt	2,362.0	2,780.3
Carrying Value [Member]
Financial Assets [Abstract]
Cash and cash equivalents	3,088.1	3,309.5
Time deposits	9.2	9.8
Debt	2,362.0	2,780.3
Estimated Fair Value [Member] | Level 1 [Member]
Financial Assets [Abstract]
Cash and cash equivalents	3,088.1	3,309.5
Estimated Fair Value [Member] | Level 2 [Member]
Financial Assets [Abstract]
Time deposits	9.2	9.8
Debt	1,970.9	2,387.0
Equity securities [Member] | Carrying Value [Member]
Financial Assets [Abstract]
Other investments	291.4	270.9
Equity securities [Member] | Estimated Fair Value [Member] | Level 3 [Member]
Financial Assets [Abstract]
Other investments	$ 291.4	$ 270.9

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Amount of cash and cash equivalent. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate.

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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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Any certificate of deposit or savings account held by a bank or other financial institution for a short-term specified period of time. Because of their short-term, time deposits are considered 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. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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