Cash, Cash Equivalents and Investments (Tables)

9 Months Ended

Sep. 30, 2011

Cash Cash Equivalents And Investments [Abstract]

Cash and cash equivalents [Table Text Block]

The following table summarizes the Company's cash and cash equivalents (in millions):

	As of
	September 30, 2011		December 31, 2010
Cash:
Demand deposits	$	571.8	$	413.0
Time deposits	976.2		273.3
Total cash	1,548.0		686.3
Cash equivalents:
U.S. government securities	—		76.7
Government-sponsored enterprise obligations	—		5.0
Commercial paper	—		4.0
Money market funds	1,174.4		1,039.9
Total cash equivalents	1,174.4		1,125.6
Total cash and cash equivalents	$	2,722.4	$	1,811.9

Unrealized gains and losses, and fair value of available-for-sale and trading securities [Text Block]

The following table summarizes the Company's unrealized gains and losses, and fair value of investments designated as available-for-sale and trading securities, as of September 30, 2011, and December 31, 2010 (in millions):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
As of September 30, 2011:
Fixed income securities:
U.S. government securities	$	361.6	$	—	$	(0.1	)	$	361.5
Government-sponsored enterprise obligations	368.2		0.3		(0.1		)	368.4
Foreign government debt securities	2.4		—		—			2.4
Certificates of deposit	38.0		—		—			38.0
Asset-backed securities	111.7		0.3		(0.1		)	111.9
Corporate debt securities	516.1		0.7		(1.2		)	515.6
Total fixed income securities	1,398.0		1.3		(1.5		)	1,397.8
Total available-for-sale securities	1,398.0		1.3		(1.5		)	1,397.8
Trading securities (1)	10.1		—		—			10.1
Total	$	1,408.1	$	1.3	$	(1.5	)	$	1,407.9
Reported as:
Short-term investments	$	632.3	$	0.2	$	(0.1	)	$	632.4
Long-term investments	775.8		1.1		(1.4		)	775.5
Total	$	1,408.1	$	1.3	$	(1.5	)	$	1,407.9

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(1) Balance includes the Company's non-qualified deferred compensation plan assets. For additional information, see Note 12, Employee Benefits, under the section Deferred Compensation Plan.

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
As of December 31, 2010:
Fixed income securities:
U.S. government securities	$	158.2	$	0.2	$	—		$	158.4
Government-sponsored enterprise obligations	213.8		0.4		(0.2		)	214.0
Foreign government debt securities	46.8		0.2		—			47.0
Certificates of deposit	20.9		0.1		—			21.0
Commercial paper	9.5		—		—			9.5
Asset-backed securities	90.1		—		(0.1		)	90.0
Corporate debt securities	459.7		2.2		(0.2		)	461.7
Total fixed income securities	999.0		3.1		(0.5		)	1,001.6
Total available-for-sale securities	999.0		3.1		(0.5		)	1,001.6
Trading securities (1)	8.1		—		—			8.1
Total	$	1,007.1	$	3.1	$	(0.5	)	$	1,009.7
Reported as:
Short-term investments	$	473.6	$	0.9	$	—		$	474.5
Long-term investments	533.5		2.2		(0.5		)	535.2
Total	$	1,007.1	$	3.1	$	(0.5	)	$	1,009.7

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(1) Balance includes the Company's non-qualified deferred compensation plan assets. For additional information, see Note 12, Employee Benefits, under the section Deferred Compensation Plan.

Maturities of available-for-sale investments and publicly-traded securities [Text Block]

The following table presents the maturities of the Company's available-for-sale and trading securities, as of September 30, 2011 (in millions):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Due within one year	$	622.2	$	0.2	$	(0.1	)	$	622.3
Due between one and five years	775.8		1.1		(1.4		)	775.5
No contractual maturity	10.1		—		—			10.1
Total	$	1,408.1	$	1.3	$	(1.5	)	$	1,407.9

Trading and available-for-sale investments in an unrealized loss position [Text Block]

The following tables present the Company's trading and available-for-sale investments that are in an unrealized loss position as of September 30, 2011, and December 31, 2010 (in millions):

	Less than 12 Months					12 Months or Greater				Total
	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
As of September 30, 2011
Corporate debt securities	$	284.0	$	(1.3	)	$	—	$	—	$	284.0	$	(1.3	)
U.S. government securities	136.0		(0.1		)	—		—		136.0		(0.1		)
Government-sponsored enterprise obligations	213.6		(0.1		)	—		—		213.6		(0.1		)
Asset-backed securities (1)	64.3		—			0.8		—		65.1		—
Total	$	697.9	$	(1.5	)	$	0.8	$	—	$	698.7	$	(1.5	)

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(1) Balance includes investments that were in an immaterial unrealized loss position as of September 30, 2011.

	Less than 12 Months					12 Months or Greater				Total
	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
As of December 31, 2010
Corporate debt securities (1)	$	104.3	$	(0.2	)	$	28.8	$	—	$	133.1	$	(0.2	)
Government-sponsored enterprise obligations	57.8		(0.2		)	—		—		57.8		(0.2		)
Foreign government debt securities (1)	—		—			6.2		—		6.2		—
Commercial paper (1)	5.0		—			—		—		5.0		—
Asset-backed securities	54.7		(0.1		)	—		—		54.7		(0.1		)
Total	$	221.8	$	(0.5	)	$	35.0	$	—	$	256.8	$	(0.5	)

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(1) Balance includes investments that were in an immaterial unrealized loss position as of December 31, 2010.

Restricted cash and investments [Text Block]

The following table summarizes the Company's cash and investments that are classified as restricted cash and investments in the condensed consolidated balance sheets (in millions):

	As of
	September 30, 2011		December 31, 2010
Restricted cash:
Demand deposits	$	0.5	$	1.7
Total restricted cash	0.5		1.7
Restricted investments:
U.S. government securities	—		0.6
Corporate debt securities	1.8		2.7
Mutual funds	1.2		—
Money market funds	87.0		114.3
Total restricted investments	90.0		117.6
Total restricted cash and investments	$	90.5	$	119.3