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FINANCIAL INSTRUMENTS (Tables)
 9 Months Ended
Sep. 30, 2018
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 marketable securities’ amortized cost, gross unrealized gains, gross unrealized losses, and fair value by significant investment category reported as cash and cash equivalents, short-term, or long-term investments as of September 30, 2018, and December 31, 2017 (in millions):
 
 
 
 
 
 
 
 
 
Reported as:
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
 
Cash and
Cash
Equivalents
 
Short-
term
Investments
 
Long-
term
Investments
September 30, 2018
 
 
 
 
 
 
 
 
 
 
 
 
 
Cash
$
260.6

 
$
—

 
$
—

 
$
260.6

 
$
260.6

 
$
—

 
$
—

Level 1:
 
 
 
 
 
 
 
 
 
 
 
 
 
Money market funds
736.2

 
—

 
—

 
736.2

 
736.2

 
—

 
—

U.S. treasuries
1,259.2

 
—

 
(8.3
)
 
1,250.9

 
—

 
806.6

 
444.3

Subtotal
1,995.4

 
—

 
(8.3
)
 
1,987.1

 
736.2

 
806.6

 
444.3

Level 2:
 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial paper
146.4

 
—

 
—

 
146.4

 
11.5

 
134.9

 
—

Corporate debt securities
1,354.8

 
0.4

 
(5.2
)
 
1,350.0

 
—

 
692.4

 
657.6

U.S. government agencies
819.5

 
—

 
(6.0
)
 
813.5

 
—

 
493.7

 
319.8

Municipal securities
12.9

 
—

 
—

 
12.9

 
—

 
—

 
12.9

Subtotal
2,333.6

 
0.4

 
(11.2
)
 
2,322.8

 
11.5

 
1,321.0

 
990.3

Total assets measured at fair value
$
4,589.6

 
$
0.4

 
$
(19.5
)
 
$
4,570.5

 
$
1,008.3

 
$
2,127.6

 
$
1,434.6

 
 
 
 
 
 
 
 
 
 
Reported as:
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
 
Cash and
Cash
Equivalents
 
Short-
term
Investments
 
Long-
term
Investments
December 31, 2017
 
 
 
 
 
 
 
 
 
 
 
 
 
Cash
$
197.7

 
$
—

 
$
—

 
$
197.7

 
$
197.7

 
$
—

 
$
—

Level 1:
 
 
 
 
 
 
 
 
 
 
 
 
 
Money market funds
445.0

 
—

 
—

 
445.0

 
445.0

 
—

 
—

U.S. treasuries
1,029.1

 
—

 
(4.7
)
 
1,024.4

 
5.5

 
396.2

 
622.7

Subtotal
1,474.1

 
—

 
(4.7
)
 
1,469.4

 
450.5

 
396.2

 
622.7

Level 2:
 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial paper
38.4

 
—

 
—

 
38.4

 
—

 
38.4

 
—

Corporate debt securities
946.6

 
0.2

 
(4.4
)
 
942.4

 
—

 
403.9

 
538.5

U.S. government agencies
901.3

 
—

 
(4.4
)
 
896.9

 
—

 
311.7

 
585.2

Non-U.S. government securities
2.5

 
—

 
—

 
2.5

 
—

 
2.5

 
—

Municipal securities
301.1

 
—

 
(1.9
)
 
299.2

 
—

 
159.7

 
139.5

Subtotal
2,189.9

 
0.2

 
(10.7
)
 
2,179.4

 
—

 
916.2

 
1,263.2

Total assets measured at fair value
$
3,861.7

 
$
0.2

 
$
(15.4
)
 
$
3,846.5

 
$
648.2

 
$
1,312.4

 
$
1,885.9
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 September 30, 2018 (in millions):
 
Amortized
Cost
 
Fair
Value
Mature in less than one year
$
2,145.5

 
$
2,139.2

Mature in one to five years
1,447.3

 
1,434.5

Total
$
3,592.8

 
$
3,573.7
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
 
September 30,
2018
 
December 31,
2017
 
September 30,
2018
 
December 31,
2017
Notional amounts:
 
 
 
 
 
 
 
     Forward contracts
$
161.8

 
$
128.5

 
$
161.9

 
$
168.4

Gross fair value recorded in:
 
 
 
 
 
 
 
     Prepaids and other current assets
$
4.8

 
$
0.9

 
$
3.4

 
$
1.2

     Other accrued liabilities
$
0.5

 
$
2.9

 
$
0.6

 
$
4.6