Restricted Securities Available For Sale (Tables)

3 Months Ended

Mar. 31, 2014

Restricted Securities Available For Sale [Abstract]

Schedule Of Restricted Securities Available For Sale

(In millions)	As of March 31, 2014
	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Commercial paper	$	24.1	$	–	$	–	$	24.1
US Government and agency securities		19.9		–		(0.1)		19.8
Certificates of deposit		5.1		–		–		5.1
Corporate bonds		3.4		–		(0.1)		3.3
Total restricted securities available for sale		52.5		–		(0.2)		52.3
(In millions)	As of December 31, 2013
	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Commercial paper	$	23.9	$	–	$	–	$	23.9
US Government and agency securities		22.3		–		(0.2)		22.1
Certificates of deposit		4.6		–		–		4.6
Corporate bonds		3.1		–		(0.1)		3.0
Total restricted securities available for sale		53.9		–		(0.3)		53.6

Schedule Of Restricted Securities Available For Sale By Aging Category

(In millions)	Securities Available for Sale with Gross Unrealized Losses as of March 31, 2014
	Less than 12 Months				12 Months or More
	Estimated Fair Value		Gross Unrealized Losses		Estimated Fair Value		Gross Unrealized Losses			Total Estimated Fair Value		Total Gross Unrealized Losses
Commercial paper	$	6.9	$	–	$	–	$	–		$	6.9	$	-
US Government and agency securities		5.8		(0.1)		1.1		–			6.9		(0.1)
Certificates of deposit		1.0		–		–		–			1.0		–
Corporate bonds		1.3		-		0.9		(0.1	)		2.2		(0.1)
Total restricted securities available for sale		15.0		(0.1)		2.0		(0.1	)		17.0		(0.2)
(In millions)	Securities Available for Sale with Gross Unrealized Losses as of December 31, 2013
	Less than 12 Months				12 Months or More
	Estimated Fair Value		Gross Unrealized Losses		Estimated Fair Value		Gross Unrealized Losses			Total Estimated Fair Value		Total Gross Unrealized Losses
Commercial paper	$	10.0	$	–	$	–	$	–		$	10.0	$	–
US Government and agency securities		11.8		(0.2)		–		–			11.8		(0.2)
Certificates of deposit		1.9		–		–		–			1.9		–
Corporate bonds		2.3		(0.1)		–		–			2.3		(0.1)
Total restricted securities available for sale		26.0		(0.3)		–		–			26.0		(0.3)

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

(In millions)	As of
	March 31, 2014				December 31, 2013
	Cost		Estimated Fair Value		Cost		Estimated Fair Value
Contractual Maturity
Within one year	$	39.0	$	39.0	$	41.6	$	41.6
Over one year to five years		8.7		8.6		7.8		7.8
Over five years to ten years		4.6		4.5		4.5		4.2
Over ten years		0.2		0.2		–		–
Total restricted securities available for sale	$	52.5	$	52.3	$	53.9	$	53.6