Long-term and Short-term Debt (Tables)

12 Months Ended

Sep. 30, 2021

Debt Disclosure [Abstract]

Schedule of Debt

Long-term debt consists of (in millions):

	September 30,
	2021		2020
0.35% notes, payable in August 2023	$	600.0	$	—
2.875% notes, payable in March 2025	315.6		320.1
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		—
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		—
5.20% debentures, payable in January 2098	200.0		200.0
Unamortized discount, capitalized lease obligations and other	(51.0)		(45.4)
Long-term debt	$	3,464.6	$	1,974.7

Schedule of Fair Value of Long-term Debt

The following table presents the carrying amounts and estimated fair values of long-term debt not recorded at fair value in the Consolidated Balance Sheet (in millions):

	September 30, 2021				September 30, 2020
	Carrying Value		Fair Value		Carrying Value		Fair Value
Long-term debt	$	3,464.6	$	3,874.8	$	1,974.7	$	2,497.7