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Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2017
Fair Value Disclosures [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 or short-term or long-term investments as of December 31, 2017, and 2016 (in millions):
 
 
 
 
 
 
 
 
 
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 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

 
 
 
 
 
 
 
 
 
Reported as:
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
 
Cash and
Cash
Equivalents
 
Short-term
Investments
 
Long-term
Investments
December 31, 2016
 
 
 
 
 
 
 
 
 
 
 
 
 
Cash
$
227.7

 
$
—

 
$
—

 
$
227.7

 
$
227.7

 
$
—

 
$
—

Level 1:
 
 
 
 
 
 
 
 
 
 
 
 
 
Money market funds
612.4

 
—

 
—

 
612.4

 
612.4

 
—

 
—

U.S. treasuries
625.9

 
0.1

 
(2.0
)
 
624.0

 
157.9

 
168.4

 
297.7

Subtotal
1,238.3

 
0.1

 
(2.0
)
 
1,236.4

 
770.3

 
168.4

 
297.7

Level 2:
 
 
 
 
 
 
 
 
 
 
 
 
 
Commercial paper
139.6

 
—

 
—

 
139.6

 
31.1

 
108.5

 
—

Corporate securities
1,471.8

 
0.7

 
(5.0
)
 
1,467.5

 
2.9

 
555.4

 
909.2

U.S. government agencies
938.7

 
0.5

 
(2.9
)
 
936.3

 
—

 
342.7

 
593.6

Non-U.S. government securities
18.5

 
—

 
—

 
18.5

 
—

 
16.0

 
2.5

Municipal securities
815.4

 
—

 
(3.5
)
 
811.9

 
4.6

 
327.0

 
480.3

Subtotal
3,384.0

 
1.2

 
(11.4
)
 
3,373.8

 
38.6

 
1,349.6

 
1,985.6

Total assets measured at fair value
$
4,850.0

 
$
1.3

 
$
(13.4
)
 
$
4,837.9

 
$
1,036.6

 
$
1,518.0

 
$
2,283.3
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), at December 31, 2017 (in millions):
 
Amortized
Cost
 
Fair
Value
Mature in less than one year
$
1,320.7

 
$
1,317.9

Mature in one to five years
1,898.3

 
1,885.9

Total
$
3,219.0

 
$
3,203.8
Schedule Of Available-For-Sale Investments With Unrealized Losses
The following tables present the breakdown of the available-for-sale investments with unrealized losses at December 31, 2017, and 2016 (in millions):
 
Unrealized losses less
than 12 months
 
Unrealized losses 12
months or greater
 
Total
December 31, 2017
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
Corporate securities
$
567.6

 
$
(2.1
)
 
$
277.0

 
$
(2.3
)
 
$
844.6

 
$
(4.4
)
U.S. treasuries
763.5

 
(2.5
)
 
206.2

 
(2.2
)
 
969.7

 
(4.7
)
U.S. government agencies
428.9

 
(1.3
)
 
345.5

 
(3.1
)
 
774.4

 
(4.4
)
Municipal securities
236.3

 
(1.3
)
 
51.7

 
(0.6
)
 
288.0

 
(1.9
)
 
$
1,996.3

 
$
(7.2
)
 
$
880.4

 
$
(8.2
)
 
$
2,876.7

 
$
(15.4
)
December 31, 2016
 
 
 
 
 
 
 
 
 
 
 
Corporate securities
$
1,056.1

 
$
(5.0
)
 
$
—

 
$
—

 
$
1,056.1

 
$
(5.0
)
U.S. treasuries
357.1

 
(2.0
)
 
—

 
—

 
357.1

 
(2.0
)
U.S. government agencies
538.2

 
(2.9
)
 
—

 
—

 
538.2

 
(2.9
)
Municipal securities
728.8

 
(3.5
)
 
—

 
—

 
728.8

 
(3.5
)
 
$
2,680.2

 
$
(13.4
)
 
$
—

 
$
—

 
$
2,680.2

 
$
(13.4
)
Derivative Instruments Used to Hedge against Balance Sheet Foreign Currency Exposures
These derivative instruments are used to hedge against balance sheet foreign currency exposures. The related gains and losses were as follows (in millions):
 
Years Ended December 31,
 
2017
 
2016
 
2015
Recognized gains (losses) in interest and other income, net
$
(9.2
)
 
$
6.4

 
$
7.0

Foreign exchange gains (losses) related to balance sheet re-measurement
$
9.7

 
$
(5.6
)
 
$
(7.9
)
Gross Notional Amounts for Outstanding Derivatives
Total gross notional amounts (in USD) for derivatives and aggregate gross fair value outstanding at the end of each period were as follows (in millions):
 
Derivatives Designated as Hedging Instruments
 
Derivatives Not Designated as Hedging Instruments
 
December 31,
2017
 
December 31,
2016
 
December 31,
2017
 
December 31,
2016
Notional amounts:
 
 
 
 
 
 
 
   Forward contracts
$
128.5

 
$
109.7

 
$
168.4

 
$
143.7

Gross fair value recorded in:
 
 
 
 
 
 
 
   Prepaid and other current assets
$
0.9

 
$
6.2

 
$
1.2

 
$
5.6

   Other accrued liabilities
$
2.9

 
$
1.0

 
$
4.6

 
$
0.6