INVESTMENTS (Tables)

12 Months Ended

Dec. 31, 2013

Investments Debt And Equity Securities [Abstract]

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):

			Gross Unrealized					Fair value
	Amortized Cost		Gains		Losses
As of December 31, 2013
Corporate debt securities	$	457.6	$	0.4	$	(0.1	)	$	457.9
U.S. government and agency debt securities		211.1		0.1		–			211.2
Foreign government debt securities		3.1		–		–			3.1
Commercial paper		68.3		–		–			68.3
Certificates of deposit		67.2		–		–			67.2
Total short and long-term investments	$	807.3	$	0.5	$	(0.1	)	$	807.7
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

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, 2013	Amortized Cost		Fair Value
Due in one year or less	$	726.7	$	727.0
Due after one year through two years		80.6		80.7
Total	$	807.3	$	807.7