Restricted Securities Available For Sale (Tables)

6 Months Ended

Jun. 30, 2013

Restricted Securities Available For Sale [Abstract]

Schedule Of Restricted Securities Available For Sale

(In millions)	As of June 30, 2013
	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
US Government and agency securities	$	25.3	$	–	$	(0.2)	$	25.1
Commercial paper		15.4		–		–		15.4
Corporate bonds		3.3		–		(0.1)		3.2
Certificates of deposit		3.8		–		–		3.8
Total restricted securities available for sale		47.8		–		(0.3)		47.5
(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

Schedule Of Restricted Securities Available For Sale By Aging Catagory

(In millions)	Securities Available for Sale with Gross Unrealized Losses As of June 30, 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
US Government and agency securities	$	12.9	$	(0.2)	$	–	$	–	$	12.9	$	(0.2)
Commercial paper		4.6		–		–		–		4.6		–
Corporate bonds		3.1		(0.1)		–		–		3.1		(0.1)
Total restricted securities available for sale		20.6		(0.3)		–		–		20.6		(0.3)
(In millions)	Securities Available for Sale with Gross Unrealized Losses As of December 31, 2012
	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
US Government and agency securities	$	16.7	$	(0.1)	$	–	$	–	$	16.7	$	(0.1)
Commercial paper		2.8		(0.1)		–		–		2.8		(0.1)
Corporate bonds		2.3		–		–		–		2.3		–
Certificates of deposit		1.5		–		–		–		1.5		–
Foreign Government bonds		0.1		–		–		–		0.1		–
Total restricted securities available for sale		23.4		(0.2)		–		–		23.4		(0.2)

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

(In millions)	As of
	June 30, 2013				December 31, 2012
	Cost		Estimated Fair Value		Cost		Estimated Fair Value
Contractual Maturity
Within one year	$	34.5	$	34.5	$	33.8	$	33.7
Over one year to five years		9.5		9.4		8.6		8.6
Over five years to ten years		3.8		3.6		3.9		3.8
Total restricted securities available for sale	$	47.8	$	47.5	$	46.3	$	46.1