Fair Value Measurements (Tables)

9 Months Ended

12 Months Ended

Sep. 30, 2011

Dec. 31, 2010

Assets measured at fair value on a recurring basis [Text Block]

The following tables provide a summary of assets measured at fair value on a recurring basis and as reported in the condensed consolidated balance sheets (in millions):



	Fair Value Measurements at September 30, 2011 Using:
	Quoted Prices in Active Markets For Identical Assets		Significant Other Observable Remaining Inputs		Significant Other Unobservable Remaining Inputs
	(Level 1)		(Level 2)		(Level 3)		Total
Available-for-sale debt securities:
U.S. government securities	$	144.8	$	216.7	$	—	$	361.5
Government-sponsored enterprise obligations	274.2		94.2		—		368.4
Foreign government debt securities	—		2.4		—		2.4
Corporate debt securities (1)	—		517.4		—		517.4
Certificate of deposit	—		38.0		—		38.0
Asset-backed securities	—		111.9		—		111.9
Money market funds (2)	1,261.4		—		—		1,261.4
Total available-for-sale debt securities	1,680.4		980.6		—		2,661.0
Total available-for-sale securities	1,680.4		980.6		—		2,661.0
Trading securities:
Mutual funds (3)	11.3		—		—		11.3
Total trading securities	11.3		—		—		11.3
Derivative assets:
Foreign exchange contracts	—		0.7		—		0.7
Total derivative assets	—		0.7		—		0.7
Total assets measured at fair value	$	1,691.7	$	981.3	$	—	$	2,673.0

________________________________


(1)	Balance includes $1.8 million of restricted investments measured at fair market value, related to the Company's India Gratuity Trust.


(2)	Balance includes $87.0 million of restricted investments measured at fair market value, related to the Company's D&O trust and acquisition related escrows.


(3)	Balance includes $1.2 million of restricted investments measured at fair market value, related to the Company's India Gratuity Trust.



	Fair Value Measurements at December 31, 2010 Using:
	Quoted Prices in Active Markets For Identical Assets		Significant Other Observable Remaining Inputs		Significant Other Unobservable Remaining Inputs
	(Level 1)		(Level 2)		(Level 3)		Total
Available-for-sale debt securities:
U.S. government securities (1)	$	54.9	$	180.8	$	—	$	235.7
Government-sponsored enterprise obligations	208.9		10.1		—		219.0
Foreign government debt securities	21.0		26.0		—		47.0
Commercial paper	—		13.5		—		13.5
Corporate debt securities (2)	2.7		461.7		—		464.4
Certificate of deposit	—		21.0		—		21.0
Asset-backed securities	—		90.0		—		90.0
Money market funds (3)	1,154.2		—		—		1,154.2
Total available-for-sale debt securities	1,441.7		803.1		—		2,244.8
Total available-for-sale securities	1,441.7		803.1		—		2,244.8
Trading securities:
Mutual funds	8.1		—		—		8.1
Total trading securities	8.1		—		—		8.1
Derivative assets:
Foreign exchange contracts	—		0.4		—		0.4
Total derivative assets	—		0.4		—		0.4
Total assets measured at fair value	$	1,449.8	$	803.5	$	—	$	2,253.3

________________________________

(1)

Balance includes $0.6 million of restricted investments measured at fair market value, related to an acquisition completed in 2005. For additional information regarding the Company's restricted investments, see Note 5, Cash, Cash Equivalents, and Investments, under the heading “Restricted Cash.” Restricted investments are included in the restricted cash balance in the condensed consolidated balance sheet.


(2)	Balance includes $2.7 million of restricted investments measured at fair market value, related to the Company's India Gratuity Trust.


(3)	Balance includes $114.3 million of restricted investments measured at fair market value, related to the Company's D&O trust and acquisition related escrows.

Fair Value, by Balance Sheet Grouping [Text Block]



	Fair Value Measurements at September 30, 2011 Using:
	Quoted Prices in Active Markets For Identical Assets		Significant Other Observable Remaining Inputs		Significant Other Unobservable Remaining Inputs
	(Level 1)		(Level 2)		(Level 3)		Total
Reported as:
Cash equivalents	$	1,174.4	$	—	$	—	$	1,174.4
Short-term investments	140.9		491.5		—		632.4
Long-term investments	288.2		487.3		—		775.5
Restricted cash and investments	88.2		1.8		—		90.0
Prepaid expenses and other current assets	—		0.7		—		0.7
Total assets measured at fair value	$	1,691.7	$	981.3	$	—	$	2,673.0



	Fair Value Measurements at December 31, 2010 Using:
	Quoted Prices in Active Markets For Identical Assets		Significant Other Observable Remaining Inputs		Significant Other Unobservable Remaining Inputs
	(Level 1)		(Level 2)		(Level 3)		Total
Reported as:
Cash equivalents	$	1,039.9	$	85.7	$	—	$	1,125.6
Short-term investments	150.7		323.8		—		474.5
Long-term investments	142.2		393.0		—		535.2
Restricted cash	117.0		0.6		—		117.6
Prepaid expenses and other current assets	—		0.4		—		0.4
Total assets measured at fair value	$	1,449.8	$	803.5	$	—	$	2,253.3

- Definition

Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

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- Definition

Tabular disclosure of the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments, assets, and liabilities. Such certain disclosures about the financial instruments, assets, and liabilities include: (1) the fair value of the required items together with their carrying amounts (as appropriate) and (2) the methodology and assumptions used in developing such estimates of fair value.

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