Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2015

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value on a Recurring Basis

The following tables provide a summary of assets and liabilities measured at fair value on a recurring basis and as reported in the Consolidated Balance Sheets (in millions):

	Fair Value Measurements at December 31, 2015 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
Assets measured at fair value:
Available-for-sale securities:
Asset-backed securities	$	—	$	311.7		$	—	$	311.7
Certificates of deposit	—		9.6			—		9.6
Commercial paper	—		17.7			—		17.7
Corporate debt securities	—		911.4			—		911.4
Foreign government debt securities	—		16.5			—		16.5
Government-sponsored enterprise obligations	—		203.7			—		203.7
Money market funds (1)	29.7		—			—		29.7
Mutual funds (2)	6.2		—			—		6.2
Publicly-traded equity securities	8.8		—			—		8.8
U.S. government securities	247.3		30.3			—		277.6
Total available-for-sale securities	292.0		1,500.9			—		1,792.9
Trading securities in mutual funds (3)	17.7		—			—		17.7
Privately-held debt and redeemable preferred   stock securities	—		—			60.2		60.2
Derivative assets:
Foreign exchange contracts	—		0.4			—		0.4
Total assets measured at fair value	$	309.7	$	1,501.3		$	60.2	$	1,871.2
Liabilities measured at fair value:
Derivative liabilities:
Foreign exchange contracts	$	—	$	(1.3	)	$	—	$	(1.3	)
Total liabilities measured at fair value	$	—	$	(1.3	)	$	—	$	(1.3	)
Total assets measured at fair value, reported as:
Cash equivalents	$	—	$	3.4		$	—	$	3.4
Restricted investments	35.9		—			—		35.9
Short-term investments	108.2		418.9			—		527.1
Long-term investments	165.6		1,078.6			—		1,244.2
Prepaid expenses and other current assets	—		0.4			—		0.4
Other long-term assets	—		—			60.2		60.2
Total assets measured at fair value	$	309.7	$	1,501.3		$	60.2	$	1,871.2
Total liabilities measured at fair value, reported as:
Other accrued liabilities	$	—	$	(1.3	)	$	—	$	(1.3	)
Total liabilities measured at fair value	$	—	$	(1.3	)	$	—	$	(1.3	)

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⁽¹⁾  Balance includes $29.7 million of restricted investments measured at fair market value, related to the Company's D&O trust and acquisitions related escrows.

⁽²⁾  Balance relates to the restricted investments measured at fair market value of the Company's India Gratuity Trust.

⁽³⁾  Balance relates to the investments measured at fair value related to the Company's non-qualified deferred compensation plan assets.

	Fair Value Measurements at December 31, 2014 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
Assets measured at fair value:
Available-for-sale securities:
Asset-backed securities	$	—	$	269.0		$	—	$	269.0
Certificates of deposit	—		10.6			—		10.6
Commercial paper	—		20.3			—		20.3
Corporate debt securities	—		738.0			—		738.0
Foreign government debt securities	—		24.6			—		24.6
Government-sponsored enterprise obligations	—		162.1			—		162.1
Money market funds (1)	594.2		—			—		594.2
Mutual funds (2)	4.0		—			—		4.0
Publicly-traded equity securities	2.0		—			—		2.0
U.S. government securities	246.0		—			—		246.0
Total available-for-sale securities	846.2		1,224.6			—		2,070.8
Trading securities in mutual funds (3)	16.3		—			—		16.3
Privately-held debt and redeemable preferred   stock securities	—		—			47.5		47.5
Derivative assets:
Foreign exchange contracts	—		0.1			—		0.1
Total assets measured at fair value	$	862.5	$	1,224.7		$	47.5	$	2,134.7
Liabilities measured at fair value:
Derivative liabilities:
Foreign exchange contracts	$	—	$	(3.9	)	$	—	$	(3.9	)
Total liabilities measured at fair value	$	—	$	(3.9	)	$	—	$	(3.9	)
Total assets measured at fair value, reported as:
Cash equivalents	$	552.9	$	23.7		$	—	$	576.6
Restricted investments	45.2		—			—		45.2
Short-term investments	87.0		245.2			—		332.2
Long-term investments	177.4		955.7			—		1,133.1
Prepaid expenses and other current assets	—		0.1			—		0.1
Other long-term assets	—		—			47.5		47.5
Total assets measured at fair value	$	862.5	$	1,224.7		$	47.5	$	2,134.7
Total liabilities measured at fair value, reported as:
Other accrued liabilities	$	—	$	(3.9	)	$	—	$	(3.9	)
Total liabilities measured at fair value	$	—	$	(3.9	)	$	—	$	(3.9	)

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⁽¹⁾  Balance includes $41.3 million of restricted investments measured at fair market value, related to the Company's D&O trust and acquisition related escrows.

⁽²⁾  Balance relates to the restricted investments measured at fair market value of the Company's India Gratuity Trust.

⁽³⁾  Balance relates to the investments measured at fair value related to the Company's non-qualified deferred compensation plan assets.