INVESTMENTS (Tables)

12 Months Ended

Dec. 31, 2012

Investments in Short and Long-Term Classified as Available-for-Sale Securities

We invest in short and long-term investments classified as available-for-sale securities. Information regarding our investments is as follows (in millions):

	Amortized Cost		Gross Unrealized					Fair value
			Gains		Losses
As of December 31, 2012
Corporate debt securities	$	383.6	$	0.3	$	(0.1	)	$	383.8
U.S. government and agency debt securities		295.8		0.1		–			295.9
Foreign government debt securities		5.0		–		–			5.0
Commercial paper		138.7		–		–			138.7
Certificates of deposit		92.2		0.1		–			92.3
Total short and long-term investments	$	915.3	$	0.5	$	(0.1	)	$	915.7
As of December 31, 2011
Corporate debt securities	$	324.8	$	0.2	$	(0.3	)	$	324.7
U.S. government and agency debt securities		177.1		0.1		–			177.2
Municipal bonds		1.0		–		–			1.0
Foreign government debt securities		6.8		–		–			6.8
Commercial paper		74.5		–		–			74.5
Certificates of deposit		88.5		–		–			88.5
Total short and long-term investments	$	672.7	$	0.3	$	(0.3	)	$	672.7

Fair Values and Gross Unrealized Losses for All Available-for-Sale Securities in Unrealized Loss Position Deemed to be Temporary

The following table shows the fair value and gross unrealized losses for all available-for-sale securities in an unrealized loss position deemed to be temporary (in millions):

	As of December 31, 2012					As of December 31, 2011
	Fair Value		Unrealized Losses			Fair value		Unrealized Losses
Corporate debt securities	$	144.2	$	(0.1	)	$	164.5	$	(0.3	)

Cost and Fair Value of Available-for-Sale Fixed-Maturity Securities by Contractual Maturity

The amortized cost and fair value of our available-for-sale fixed-maturity securities by contractual maturity are as follows (in millions):

As of December 31, 2012	Amortized Cost		Fair Value
Due in one year or less	$	671.3	$	671.6
Due after one year through two years		244.0		244.1
Total	$	915.3	$	915.7