Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2012

Fair Value Measurements

Schedule of assets and liabilities measured on a recurring basis, at fair value

	June 30, 2012
	Level 1		Level 2		Level 3		Total
Treasury bills	$	117.1	$	83.8	$	—	$	200.9
FDIC insured corporate bonds	61.0		—		—		61.0
Government Agency Securities	43.7		106.3		—		150.0
Total	$	221.8	$	190.1	$	—	$	411.9

	December 31, 2011
	Level 1		Level 2		Level 3		Total
Treasury bills	$	70.2	$	20.0	$	—	$	90.2
FDIC insured corporate bonds	114.8		—		—		114.8
Government Agency Securities	88.6		81.2		—		169.8
Money market instruments	—		0.2		—		0.2
Total	$	273.6	$	101.4	$	—	$	375.0

Schedule of assets and liabilities measured on a nonrecurring basis, at fair value

	June 30, 2012
	Level 1		Level 2		Level 3		Total
Property,plant and equipment, net	$	—	$	—	$	97.1	$	97.1
Goodwill	—		—		55.8		55.8
Intangible assets, net	—		—		23.5		23.5
Total	$	—	$	—	$	176.4	$	176.4

	December 31, 2011
	Level 1		Level 2		Level 3		Total
Property,plant and equipment, net	$	—	$	—	$	86.1	$	86.1
Goodwill	—		—		55.8		55.8
Intangible assets, net	—		—		25.9		25.9
Total	$	—	$	—	$	167.8	$	167.8