Cash, Cash Equivalents and Marketable Securities Available-for-Sale (Tables)

3 Months Ended

Mar. 31, 2013

Cash, Cash Equivalents and Marketable Securities Available-for-Sale

Schedule of available-for-sale securities by major security type and class

			Gross		Gross		Estimated
	Amortized		Unrealized		Unrealized		Fair
March 31, 2013	Cost		Gain		Loss		Value
U.S. Treasury securities	$	848.6	$	0.6	$	-	$	849.2
U.S. government-sponsored agency securities	232.9		0.3		-		233.2
U.S. government-sponsored agency MBS	558.2		1.7		(2.9)		557.0
Non-U.S. government, agency and Supranational securities	10.4		-		-		10.4
Corporate debt - global	336.3		1.0		(0.5)		336.8
Asset backed securities	38.1		-		-		38.1
Marketable equity securities	0.4		-		(0.2)		0.2
Total available-for-sale marketable securities	$	2,024.9	$	3.6	$	(3.6)	$	2,024.9

			Gross		Gross		Estimated
	Amortized		Unrealized		Unrealized		Fair
December 31, 2012	Cost		Gain		Loss		Value
U.S. Treasury securities	$	902.0	$	0.5	$	-	$	902.5
U.S. government-sponsored agency securities	303.5		0.3		-		303.8
U.S. government-sponsored agency MBS	387.2		1.6		(1.8)		387.0
Non-U.S. government, agency and Supranational securities	7.1		-		-		7.1
Corporate debt - global	208.5		0.9		(0.2)		209.2
Marketable equity securities	0.4		-		(0.1)		0.3
Total available-for-sale marketable securities	$	1,808.7	$	3.3	$	(2.1)	$	1,809.9

Schedule of duration periods of available-for-sale debt securities

	Amortized		Fair
	Cost		Value
Duration of one year or less	$	278.2	$	277.6
Duration of one through three years	1,458.0		1,458.6
Duration of three through five years	264.5		264.9
Duration of over five years	23.8		23.6
Total	$	2,024.5	$	2,024.7