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Cash Equivalents and Investments (Tables)
 12 Months Ended
Dec. 31, 2017
Cash Equivalents and Investments [Abstract]  
Investments in available-for-sale and trading securities
The following table summarizes the Company's unrealized gains and losses and fair value of investments designated as available-for-sale as of December 31, 2017 and December 31, 2016 (in millions):
 
As of December 31, 2017
 
As of December 31, 2016
 
Amortized
Cost
 
Gross Unrealized
Gains
 
Gross Unrealized
Losses
 
Estimated Fair
Value
 
Amortized
Cost
 
Gross Unrealized
Gains
 
Gross Unrealized
Losses
 
Estimated Fair
Value
Fixed income securities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Asset-backed securities
$
287.1

 
$
—

 
$
(0.6
)
 
$
286.5

 
$
303.0

 
$
0.2

 
$
(0.2
)
 
$
303.0

Certificates of deposit
83.8

 
—

 
—

 
83.8

 
66.1

 
—

 
—

 
66.1

Commercial paper
217.1

 
—

 
—

 
217.1

 
147.7

 
—

 
—

 
147.7

Corporate debt securities
929.6

 
0.4

 
(3.0
)
 
927.0

 
846.5

 
0.4

 
(2.0
)
 
844.9

Foreign government debt securities
62.9

 
—

 
(0.2
)
 
62.7

 
34.0

 
—

 
(0.1
)
 
33.9

Time deposits
239.2

 
—

 
—

 
239.2

 
264.6

 
—

 
—

 
264.6

U.S. government agency securities
143.9

 
—

 
(0.7
)
 
143.2

 
127.0

 
—

 
(0.3
)
 
126.7

U.S. government securities
406.8

 
0.1

 
(0.9
)
 
406.0

 
390.7

 
0.1

 
(0.4
)
 
390.4

Total fixed income securities
2,370.4

 
0.5

 
(5.4
)
 
2,365.5

 
2,179.6

 
0.7

 
(3.0
)
 
2,177.3

Money market funds
969.8

 
—

 
—

 
969.8

 
592.2

 
—

 
—

 
592.2

Privately-held debt and redeemable preferred stock securities
15.9

 
37.4

 
—

 
53.3

 
15.9

 
26.4

 
—

 
42.3

Publicly-traded equity securities
—

 
—

 
—

 
—

 
5.3

 
—

 
(0.7
)
 
4.6

Total available-for-sale securities
$
3,356.1

 
$
37.9

 
$
(5.4
)
 
$
3,388.6

 
$
2,793.0

 
$
27.1

 
$
(3.7
)
 
$
2,816.4

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Reported as:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Cash equivalents
$
1,279.0

 
$
—

 
$
—

 
$
1,279.0

 
$
907.1

 
$
—

 
$
—

 
$
907.1

Restricted investments(*)
41.8

 
—

 
—

 
41.8

 
42.9

 
—

 
—

 
42.9

Short-term investments
1,027.2

 
0.1

 
(1.2
)
 
1,026.1

 
753.4

 
0.1

 
(1.2
)
 
752.3

Long-term investments
992.2

 
0.4

 
(4.2
)
 
988.4

 
1,073.7

 
0.6

 
(2.5
)
 
1,071.8

Other long-term assets
15.9

 
37.4

 
—

 
53.3

 
15.9

 
26.4

 
—

 
42.3

Total
$
3,356.1

 
$
37.9

 
$
(5.4
)
 
$
3,388.6

 
$
2,793.0

 
$
27.1

 
$
(3.7
)
 
$
2,816.4

________________________________
(*)  
Balance includes $31.4 million and $4.0 million of short-term restricted investments classified as prepaid expenses and other current assets.

Maturities of fixed income securities
The following table presents the contractual maturities of the Company's total fixed income securities as of December 31, 2017 (in millions):
 
Amortized
Cost
 
Estimated Fair
Value
Due in less than one year
$
1,378.2

 
$
1,377.1

Due between one and five years
992.2

 
988.4

Total
$
2,370.4

 
$
2,365.5
Available-for-sale investments in an unrealized loss position
The following tables present the Company's available-for-sale securities that were in an unrealized loss position as of December 31, 2017 and December 31, 2016 (in millions):
 
As of December 31, 2017
 
Less than 12 Months
 
12 Months or Greater
 
Total
 
Fair
Value
 
Unrealized
Loss
 
Fair
Value
 
Unrealized
Loss
 
Fair
Value
 
Unrealized
Loss
Fixed income securities:
 
 
 
 
 
 
 
 
 
 
 
Asset-backed securities
$
215.2

 
$
(0.4
)
 
$
38.4

 
$
(0.2
)
 
$
253.6

 
$
(0.6
)
Corporate debt securities
646.7

 
(2.1
)
 
108.6

 
(0.9
)
 
755.3

 
(3.0
)
Foreign government debt securities
47.3

 
(0.2
)
 
6.6

 
—

 
53.9

 
(0.2
)
U.S. government agency securities
68.3

 
(0.2
)
 
67.9

 
(0.5
)
 
136.2

 
(0.7
)
U.S. government securities
260.8

 
(0.7
)
 
51.8

 
(0.2
)
 
312.6

 
(0.9
)
Total available-for sale securities
$
1,238.3

 
$
(3.6
)
 
$
273.3

 
$
(1.8
)
 
$
1,511.6

 
$
(5.4
)


 
As of December 31, 2016
 
Less than 12 Months 
 
12 Months or Greater 
 
Total 
 
Fair
Value 
 
Unrealized
Loss 
 
Fair
Value 
 
Unrealized
Loss 
 
Fair
Value 
 
Unrealized
Loss 
Fixed income securities:
 
 
 
 
 
 
 
 
 
 
 
Asset-backed securities
$
122.2

 
$
(0.2
)
 
$
—

 
$
—

 
$
122.2

 
$
(0.2
)
Corporate debt securities
470.8

 
(1.9
)
 
76.7

 
(0.1
)
 
547.5

 
(2.0
)
Foreign government debt securities
20.3

 
(0.1
)
 
—

 
—

 
20.3

 
(0.1
)
U.S. government agency securities
106.7

 
(0.3
)
 
—

 
—

 
106.7

 
(0.3
)
U.S. government securities
254.1

 
(0.4
)
 
—

 
—

 
254.1

 
(0.4
)
Total fixed income securities
974.1

 
(2.9
)
 
76.7

 
(0.1
)
 
1,050.8

 
(3.0
)
Publicly-traded equity securities
4.6

 
(0.7
)
 
—

 
—

 
4.6

 
(0.7
)
Total available-for sale securities
$
978.7

 
$
(3.6
)
 
$
76.7

 
$
(0.1
)
 
$
1,055.4

 
$
(3.7
)