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Financial Instruments (Tables)
 9 Months Ended
Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]  
Summary of financial assets with maturities of less than 90 days included within cash and cash equivalents
The following table summarizes our financial assets with maturities of less than 90 days from the date of purchase included in cash and cash equivalents in our condensed consolidated balance sheets:
(In millions)
As of
September 30,
2018
 
As of
December 31,
2017
Commercial paper
$
125.3

 
$
30.5

Overnight reverse repurchase agreements
23.7

 
3.6

Money market funds
1,695.1

 
948.0

Short-term debt securities
56.8

 
247.3

Total
$
1,900.9

 
$
1,229.4
Marketable debt and equity securities
The following tables summarize our marketable debt and equity securities, classified as available-for-sale:
As of September 30, 2018 (In millions)
Fair
Value
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Amortized
Cost
Corporate debt securities
 
 
 
 
 
 
 
Current
$
1,273.7

 
$
0.1

 
$
(0.4
)
 
$
1,274.0

Non-current
677.9

 
0.5

 
(0.8
)
 
678.2

Government securities
 
 
 
 
 
 
 
Current
767.9

 
—

 
(0.5
)
 
768.4

Non-current
293.0

 
—

 
(0.6
)
 
293.6

Mortgage and other asset backed securities
 
 
 
 
 
 
 
Current
0.1

 
—

 
—

 
0.1

Non-current
273.6

 
0.1

 
(0.6
)
 
274.1

Total marketable debt securities
$
3,286.2

 
$
0.7

 
$
(2.9
)
 
$
3,288.4

Marketable equity securities, non-current
$
624.8

 
$
132.6

 
$
(4.4
)
 
$
496.6

As of December 31, 2017 (In millions)
Fair
Value
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Amortized
Cost
Corporate debt securities
 
 
 
 
 
 
 
Current
$
1,039.3

 
$
—

 
$
(0.2
)
 
$
1,039.5

Non-current
1,570.5

 
0.9

 
—

 
1,569.6

Government securities
 
 
 
 
 
 
 
Current
1,075.1

 
0.1

 
(0.7
)
 
1,075.7

Non-current
844.2

 
0.2

 
(1.1
)
 
845.1

Mortgage and other asset backed securities
 
 
 
 
 
 
 
Current
0.8

 
—

 
—

 
0.8

Non-current
642.6

 
1.1

 
(0.8
)
 
642.3

Total marketable debt securities
$
5,172.5

 
$
2.3

 
$
(2.8
)
 
$
5,173.0

Marketable equity securities, non-current
$
11.8

 
$
1.8

 
$
(4.4
)
 
$
14.4
Summary of contractual maturities: available-for-sale securities
The estimated fair value and amortized cost of our marketable debt securities available-for-sale by contractual maturity are summarized as follows:
 
As of September 30, 2018
 
As of December 31, 2017
(In millions)
Estimated
Fair Value
 
Amortized
Cost
 
Estimated
Fair Value
 
Amortized
Cost
Due in one year or less
$
2,041.7

 
$
2,042.5

 
$
2,115.2

 
$
2,116.0

Due after one year through five years
1,111.2

 
1,112.3

 
2,730.0

 
2,730.0

Due after five years
133.3

 
133.6

 
327.3

 
327.0

Total available-for-sale securities
$
3,286.2

 
$
3,288.4

 
$
5,172.5

 
$
5,173.0
Proceeds from marketable debt securities
The proceeds from maturities and sales of marketable debt securities and resulting realized gains and losses are summarized as follows:
 
For the Three Months
Ended September 30,
 
For the Nine Months
Ended September 30,
(In millions)
2018
 
2017
 
2018
 
2017
Proceeds from maturities and sales
$
1,192.0

 
$
888.1

 
$
7,994.7

 
$
4,472.6

Realized gains
$
0.4

 
$
0.3

 
$
3.0

 
$
2.7

Realized losses
$
(0.6
)
 
$
(1.2
)
 
$
(10.8
)
 
$
(4.4
)