Available For Sale Securities (Tables)

12 Months Ended

Dec. 31, 2012

Available For Sale Securities [Abstract]

Schedule Of Restricted Securities Available For Sale

(In millions)	As of December 31, 2012
	Cost		Gross Unrealized Gains			Gross Unrealized Losses				Estimated Fair Value
US Government and agency securities	$	20.6	$	-		$	(0.1		)	$	20.5
Commercial paper		18.9		-			(0.1		)		18.8
Corporate bonds		3.3		-			-				3.3
Certificates of deposit		3.3		-			-				3.3
Foreign Government bonds		0.2		-			-				0.2
Total restricted securities available for sale	$	46.3	$	-		$	(0.2		)	$	46.1
(In millions)	As of December 31, 2011
	Cost		Gross Unrealized Gains			Gross Unrealized Losses				Estimated Fair Value
Corporate bonds	$	0.8	$		-	$		-		$	0.8
Total restricted securities available for sale	$	0.8	$		-	$		-		$	0.8

Schedule Of Cost And Estimated Fair Values Of Debt Securities By Contractual Maturity

(In millions)	As of December 31,
	2012				2011
	Cost		Estimated Fair Value		Cost		Estimated Fair Value
Contractual Maturity
Within one year	$	33.8	$	33.7	$	-	$	-
Over one year to five years		8.6		8.6		0.8		0.8
Over five years to ten years		3.9		3.8		-		-
Total restricted securities available for sale	$	46.3	$	46.1	$	0.8	$	0.8