Debt - Schedule of Carrying Value of Individual Components of Debt (Details) - USD ($) $ in Millions	Mar. 31, 2023	Sep. 30, 2022
Debt Instrument [Line Items]
Total debt	$ 9,505.6	$ 7,787.2
Less: current portion of debt	501.6	212.2
Long-term debt due after one year	9,004.0	7,575.0
Commercial Paper [Member]
Debt Instrument [Line Items]
Total debt	291.4
Notes Due Fiscal 2024 To 2028 [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Total debt	3,435.6	3,433.4
Notes Due Fiscal 2029 to 2033 [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Total debt	2,746.5	2,753.3
Notes Due Fiscal 2037 to 2047 [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Total debt	177.5	177.8
Term Loan Facilities [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Total debt	1,597.1	598.2
Revolving Credit and Swing Facilities [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Total debt	218.1	286.3
Receivables Securitization [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Total debt	375.0
Finance Lease Obligations [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Total debt	410.9	287.5
Vendor Financing and Commercial Card Programs [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Total debt	128.5	123.1
International and Other Debt [Member]
Debt Instrument [Line Items]
Total debt	$ 125.0	$ 127.6