The investment portfolio consisted of the following marketable securities at June 30, 2012 and September 30, 2011:



	June 30, 2012
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(In millions)
Type of security:
U.S. Treasury securities	$	60.8	$	—	$	(0.1	)	$	60.7
Obligations of U.S. government agencies	82.7		—		—			82.7
Corporate debt securities issued under the FDIC Temporary Liquidity Guarantee Program	39.3		—		—			39.3
Corporate debt securities	95.9		0.1		—			96.0
Total debt securities	278.7		0.1		(0.1		)	278.7
Certificates of deposit	5.0		—		—			5.0
Total marketable securities, available-for-sale	$	283.7	$	0.1	$	(0.1	)	$	283.7



	September 30, 2011
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(In millions)
Type of security:
U.S. Treasury securities	$	16.3	$	—	$	—		$	16.3
Obligations of U.S. government agencies	73.7		0.1		—			73.8
Corporate debt securities issued under the FDIC Temporary Liquidity Guarantee Program	103.7		0.1		—			103.8
Corporate debt securities	98.8		—		(0.1		)	98.7
Total debt securities	292.5		0.2		(0.1		)	292.6
Certificates of deposit	5.0		—		—			5.0
Total marketable securities, available-for-sale	$	297.5	$	0.2	$	(0.1	)	$	297.6