Long-term and Short-term Debt (Tables)

12 Months Ended

Sep. 30, 2015

Debt Disclosure [Abstract]

Schedule of Debt

Long-term debt consists of (in millions):

	September 30,
	2015			2014
5.65% notes, payable in December 2017	$	250.0		$	250.0
2.050% notes, payable in March 2020	304.2			—
2.875% notes, payable in March 2025	301.2			—
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	(54.5		)	(49.6		)
Long-term debt	$	1,500.9		$	900.4