Marketable Securities (Tables)

9 Months Ended

Jun. 30, 2011

Marketable Securities [Abstract]

Marketable Securities

	June 30, 2011
			Gross		Gross
	Amortized		Unrealized		Unrealized
	Cost		Gains		Losses		Fair Value
	(In millions)
Type of security:
U.S. Treasury securities	$	9.1	$	—	$	—	$	9.1
Obligations of U.S. government agencies		73.2		0.1		—		73.3
Corporate debt securities issued under the FDIC Temporary Liquidity Guarantee Program		114.0		0.1		—		114.1
Corporate debt securities		95.5		0.1		—		95.6
Total debt securities		291.8		0.3		—		292.1
Certificates of deposit		5.0		—		—		5.0
Total marketable securities, available-for-sale	$	296.8	$	0.3	$	—	$	297.1
	September 30, 2010
			Gross		Gross
	Amortized		Unrealized		Unrealized
	Cost		Gains		Losses		Fair Value
	(In millions)
Type of security:
U.S. Treasury securities	$	1.0	$	—	$	—	$	1.0
Obligations of U.S. government agencies		131.0		0.2		—		131.2
Corporate debt securities issued under the FDIC Temporary Liquidity Guarantee Program		100.9		0.1		—		101.0
Corporate debt securities		39.9		—		—		39.9
Foreign government securities		14.6		—		—		14.6
Total debt securities		287.4		0.3		—		287.7
Certificates of deposit		10.0		—		—		10.0
Total marketable securities, available-for-sale	$	297.4	$	0.3	$	—	$	297.7