Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2012

Fair Value Measurements [Abstract]

Summary of Assets and Liabilities Recorded at Fair Value

(In millions)	As of March 31, 2012		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents	$	161.4	$	—	$	161.4	$	—
Marketable debt securities:
Corporate debt securities		725.9		—		725.9		—
Government securities		1,368.6		—		1,368.6		—
Mortgage and other asset backed securities		355.9		—		355.9		—
Marketable equity securities		0.1		0.1		—		—
Venture capital investments		22.1		—		—		22.1
Derivative contracts		16.9		—		16.9		—
Plan assets for deferred compensation		12.6		—		12.6		—
Total	$	2,663.5	$	0.1	$	2,641.3	$	22.1
Liabilities:
Derivative contracts	$	0.9	$	—	$	0.9	$	—
Contingent consideration		269.9		—		—		269.9
Total	$	270.8	$	—	$	0.9	$	269.9

(In millions)	As of December 31, 2011		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents	$	399.8	$	—	$	399.8	$	—
Marketable debt securities:
Corporate debt securities		602.6		—		602.6		—
Government securities		1,716.5		—		1,716.5		—
Mortgage and other asset backed securities		273.8		—		273.8		—
Marketable equity securities		0.1		0.1		—		—
Venture capital investments		23.5		—		—		23.5
Derivative contracts		39.5		—		39.5		—
Plan assets for deferred compensation		11.6		—		11.6		—
Total	$	3,067.4	$	0.1	$	3,043.8	$	23.5
Liabilities:
Derivative contracts	$	0.5	$	—	$	0.5	$	—
Contingent consideration		151.0		—		—		151.0
Total	$	151.5	$	—	$	0.5	$	151.0

Fair value of venture capital investments

	For the Three Months Ended March 31,
(In millions)	2012			2011
Fair value, beginning of period	$	23.5		$	20.8
Unrealized gains included in earnings		0.4			0.6
Unrealized losses included in earnings		(1.8	)		(1.0	)
Purchases		—			0.1
Fair value, end of period	$	22.1		$	20.5

Summary of fair and carrying value of debt instruments

	As of March 31, 2012				As of December 31, 2011
(In millions)	Fair Value		Carrying Value		Fair Value		Carrying Value
Notes payable to Fumedica	$	23.3	$	20.8	$	22.4	$	19.7
6.0% Senior Notes due March 1, 2013		469.4		449.9		474.1		449.9
6.875% Senior Notes due March 1, 2018		670.6		590.9		663.9		592.3
Total	$	1,163.3	$	1,061.6	$	1,160.4	$	1,061.9

Fair value of contingent consideration obligations

	For the Three Months Ended March 31,
(In millions)	2012		2011
Fair value, beginning of period	$	151.0	$	81.2
Additions		117.6		—
Changes in fair value		1.3		1.2
Fair value, end of period	$	269.9	$	82.4