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Fair Value Measurements - Schedule of Financial Instruments not Measured at Fair Value (Details) - USD ($) $ in Millions	Dec. 31, 2024	Sep. 30, 2024
Financial Assets [Abstract]
Other investments	$ 410.1	$ 280.7
Financial Liability [Abstract]
Debt	2,775.8	2,780.3
Carrying Value [Member]
Financial Assets [Abstract]
Cash and cash equivalents	2,808.0	3,309.5
Time deposits	8.7	9.8
Financial Liability [Abstract]
Debt	2,775.8	2,780.3
Estimated Fair Value [Member] | Level 1 [Member]
Financial Assets [Abstract]
Cash and cash equivalents	2,808.0	3,309.5
Estimated Fair Value [Member] | Level 2 [Member]
Financial Assets [Abstract]
Time deposits	8.7	9.8
Financial Liability [Abstract]
Debt	2,315.0	2,387.0
Equity securities [Member] | Carrying Value [Member]
Financial Assets [Abstract]
Other investments	401.4	270.9
Equity securities [Member] | Estimated Fair Value [Member] | Level 3 [Member]
Financial Assets [Abstract]
Other investments	$ 401.4	$ 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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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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