Fair Value Measurements (Tables)

6 Months Ended

12 Months Ended

Jun. 30, 2011

Dec. 31, 2010

Fair Value Measurements

Schedule of Company's Fair Value Hierarchy

	Fair Value Measurements at June 30, 2011 Using
Assets	Level 1		Level 2		Level 3		Total
Available-for-sale securities
Money Market funds	$	337.9	$	0	$	0	$	337.9
U.S. treasuries		125.4		0		0		125.4
Commercial paper		0		114.1		0		114.1
Corporate debt & equity securities		1.2		553.2		0		554.4
U.S. government agencies		0		388.7		0		388.7
Non-U.S. government securities		0		33.0		0		33.0
Municipal notes		0		229.5		18.7		248.2
Total available-for-sale securities		464.5		1,318.5		18.7		1,801.7
Total assets measured at fair value	$	464.5	$	1,318.5	$	18.7	$	1,801.7
Liabilities
Foreign Currency Derivatives	$	0	$	2.2	$	0	$	2.2
Total liabilities measured at fair value	$	0	$	2.2	$	0	$	2.2

	Fair Value Measurements at December 31, 2010 Using
Assets	Level 1		Level 2		Level 3		Total
Available-for-sale securities
Money Market funds	$	211.2	$	0	$	0	$	211.2
U.S. treasuries		116.3		0		0		116.3
Commercial paper		0		122.5		0		122.5
Corporate debt		0		476.8		0		476.8
U.S. government agencies		0		389.2		0		389.2
Non-U.S. government securities		0		21.1		0		21.1
Municipal notes		0		233.1		18.6		251.7
Total available-for-sale securities		327.5		1,242.7		18.6		1,588.8
Foreign Currency Derivatives		0		0.2		0		0.2
Total assets measured at fair value	$	327.5	$	1,242.9	$	18.6	$	1,589.0
Liabilities
Foreign Currency Derivatives	$	0	$	2.1	$	0	$	2.1
Total liabilities measured at fair value	$	0	$	2.1	$	0	$	2.1