Long-term and Short-term Debt (Tables)

9 Months Ended

Jun. 30, 2019

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments

Long-term debt consists of (in millions):

	June 30, 2019			September 30, 2018
2.050% notes, payable in March 2020	$	298.8		$	294.6
2.875% notes, payable in March 2025	303.3			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 and other	(62.2		)	(50.8		)
Total	2,239.9			1,225.2
Less current portion	(298.8		)	—
Long-term debt	$	1,941.1		$	1,225.2