Long-term and Short-term Debt (Tables)

12 Months Ended

Sep. 30, 2023

Debt Disclosure [Abstract]

Schedule of Debt

Long-term debt consists of (in millions):

	September 30,
	2023		2022
0.35% notes, payable in August 2023	$	—	$	600.0
2.875% notes, payable in March 2025	306.4		311.0
6.70% debentures, payable in January 2028	250.0		250.0
3.50% notes, payable in March 2029	425.0		425.0
1.75% notes, payable in August 2031	450.0		450.0
6.25% debentures, payable in December 2037	250.0		250.0
4.20% notes, payable in March 2049	575.0		575.0
2.80% notes, payable in August 2061	450.0		450.0
5.20% debentures, payable in January 2098	200.0		200.0
Unamortized discount, capitalized lease obligations and other	(34.9)		(34.1)
Total debt	2,871.5		3,476.9
Less: Current portion	(8.6)		(609.1)
Long-term debt	$	2,862.9	$	2,867.8

Schedule of Fair Value of Long-term Debt

The following table presents the carrying amounts and estimated fair values of Long-term debt in the Consolidated Balance Sheet (in millions):

	September 30, 2023				September 30, 2022
	Carrying Value		Fair Value		Carrying Value		Fair Value
Current portion of long-term debt	$	8.6	$	8.6	$	609.1	$	589.1
Long-term debt	2,862.9		2,442.6		2,867.8		2,485.4