Long-term and Short-term Debt (Tables)

12 Months Ended

Sep. 30, 2019

Debt Disclosure [Abstract]

Schedule of Debt

Long-term debt consists of (in millions):

	September 30,
	2019			2018
2.050% notes, payable in March 2020	$	299.4		$	294.6
2.875% notes, payable in March 2025	307.6			281.4
6.70% debentures, payable in January 2028	250.0			250.0
3.500% notes, payable in March 2029	425.0			—
6.25% debentures, payable in December 2037	250.0			250.0
4.200% notes, payable in March 2049	575.0			—
5.20% debentures, payable in January 2098	200.0			200.0
Unamortized discount, capitalized lease obligations and other	(50.1		)	(50.8		)
Total	2,256.9			1,225.2
Less current portion	(300.5		)	—
Long-term debt	$	1,956.4		$	1,225.2

Schedule of Fair Value of Long-term Debt

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

	September 30, 2019				September 30, 2018
	Carrying Value		Fair Value		Carrying Value		Fair Value
Current portion of long-term debt	$	300.5	$	300.1	$	—	$	—
Long-term debt	1,956.4		2,380.8		1,225.2		1,391.3