Long-term and Short-term Debt (Tables)

12 Months Ended

Sep. 30, 2017

Debt Disclosure [Abstract]

Schedule of Debt

Long-term debt consists of (in millions):

	September 30,
	2017			2016
5.65% notes, payable in December 2017	250.0			250.0
2.050% notes, payable in March 2020	298.7			305.1
2.875% notes, payable in March 2025	296.7			314.4
6.70% debentures, payable in January 2028	250.0			250.0
6.25% debentures, payable in December 2037	250.0			250.0
5.20% debentures, payable in January 2098	200.0			200.0
Unamortized discount and other	(52.0		)	(53.2		)
Total	$	1,493.4		$	1,516.3
Less current portion	(250.0		)	—
Long-term debt	1,243.4			1,516.3