FINANCIAL INSTRUMENTS (Tables)

6 Months Ended

Jun. 30, 2015

Investments, All Other Investments [Abstract]

Summary of Cash and Available-For-Sale Securities

The following tables summarize the Company’s cash and available-for-sale securities’ amortized cost, gross unrealized gains, gross unrealized losses, and fair value by significant investment category recorded as cash and cash equivalents, short-term, or long-term investments as of June 30, 2015, and December 31, 2014 (in millions):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Cash and Cash Equivalents		Short- term Investments		Long- term Investments
June 30, 2015
Cash	$	265.0	$	—	$	—		$	265.0	$	265.0	$	—	$	—
Level 1:
Money market funds	622.5		—		—			622.5		622.5		—		—
U.S. treasuries & corporate equity securities	98.1		1.4		—			99.5		—		54.2		45.3
Subtotal	720.6		1.4		—			722.0		622.5		54.2		45.3
Level 2:
Commercial paper	90.0		—		—			90.0		16.0		74.0		—
Corporate securities	868.8		1.7		(0.5		)	870.0		—		263.2		606.8
U.S. government agencies	428.4		0.6		(0.1		)	428.9		11.9		126.8		290.2
Non-U.S. government securities	24.7		—		—			24.7		—		8.6		16.1
Municipal securities	467.9		0.5		(0.4		)	468.0		—		119.3		348.7
Subtotal	1,879.8		2.8		(1.0		)	1,881.6		27.9		591.9		1,261.8
Total assets measured at fair value	$	2,865.4	$	4.2	$	(1.0	)	$	2,868.6	$	915.4	$	646.1	$	1,307.1

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Cash and Cash Equivalents		Short- term Investments		Long- term Investments
December 31, 2014
Cash	$	227.7	$	—	$	—		$	227.7	$	227.7	$	—	$	—
Level 1:
Money market funds	324.4		—		—			324.4		324.4		—		—
U.S. treasuries & corporate equity securities	46.1		—		(0.1		)	46.0		—		19.3		26.7
Subtotal	370.5		—		(0.1		)	370.4		324.4		19.3		26.7
Level 2:
Commercial paper	120.5		—		—			120.5		48.2		72.3		—
Corporate securities	904.8		1.3		(1.6		)	904.5		—		241.7		662.8
U.S. government agencies	446.0		0.3		(0.4		)	445.9		—		105.6		340.3
Non-U.S. government securities	42.2		—		(0.1		)	42.1		—		26.1		16.0
Municipal securities	385.4		0.7		(0.2		)	385.9		—		167.2		218.7
Subtotal	1,898.9		2.3		(2.3		)	1,898.9		48.2		612.9		1,237.8
Total assets measured at fair value	$	2,497.1	$	2.3	$	(2.4	)	$	2,497.0	$	600.3	$	632.2	$	1,264.5

Summary of Contractual Maturities of Cash Equivalents and Available-For-Sale Investments

The following table summarizes the contractual maturities of the Company’s cash equivalents and available-for-sale investments (excluding cash and money market funds), as of June 30, 2015 (in millions):

	Amortized Cost		Fair Value
Mature in less than one year	$	670.1	$	670.5
Mature in one to five years	1,305.6		1,307.0
Total	$	1,975.7	$	1,977.5

Gross Notional Amounts for Derivatives and Aggregate Gross Fair Value Outstanding

The notional amounts for derivative instruments provide one measure of the transaction volume. Total gross notional amounts (in USD) for outstanding derivatives and aggregate gross fair value at the end of each period were as follows (in millions):

	Derivatives Designated as Hedging Instruments				Derivatives Not Designated as Hedging Instruments
	June 30, 2015		December 31, 2014		June 30, 2015		December 31, 2014
Notional amounts:
Forward contracts	$	105.3	$	7.9	$	107.4	$	102.1
Gross fair value recorded in:
Prepaid and other current assets	$	0.8	$	1.1	$	2.1	$	7.9
Other accrued liabilities	$	—	$	—	$	0.7	$	0.1