Long-term and Short-term Debt (Tables)

12 Months Ended

Sep. 30, 2011

Long-term and Short-term Debt [Abstract]

Long-term debt

	September 30,
	2011			2010
5.65% notes, payable in 2017	$	250.0		$	250.0
6.70% debentures, payable in 2028		250.0			250.0
6.25% debentures, payable in 2037		250.0			250.0
5.20% debentures, payable in 2098		200.0			200.0
Unamortized discount and other		(45.0	)		(45.1	)
Long-term debt	$	905.0		$	904.9