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Financial Instruments (Tables)
 9 Months Ended
Sep. 30, 2014
Investments, All Other Investments [Abstract]  
Marketable debt and equity securities
The following tables summarize our marketable debt and equity securities:
As of September 30, 2014 (In millions)
Fair
Value
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Amortized
Cost
Available-for-sale:
 
 
 
 
 
 
 
Corporate debt securities
 
 
 
 
 
 
 
Current
$
196.3

 
$
0.1

 
$
—

 
$
196.2

Non-current
578.1

 
0.6

 
(0.6
)
 
578.1

Government securities
 
 
 
 
 
 
 
Current
478.7

 
0.1

 
—

 
478.6

Non-current
606.3

 
0.4

 
(0.2
)
 
606.1

Mortgage and other asset backed securities
 
 
 
 
 
 
 
Current
0.1

 
—

 
—

 
0.1

Non-current
186.9

 
0.2

 
(0.1
)
 
186.8

Total marketable debt securities
$
2,046.4

 
$
1.4

 
$
(0.9
)
 
$
2,045.9

Marketable equity securities, non-current
$
0.7

 
$
0.2

 
$
—

 
$
0.5

As of December 31, 2013 (In millions)
Fair
Value
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Amortized
Cost
Available-for-sale:
 
 
 
 
 
 
 
Corporate debt securities
 
 
 
 
 
 
 
Current
$
100.7

 
$
—

 
$
—

 
$
100.7

Non-current
339.1

 
0.4

 
(0.1
)
 
338.8

Government securities
 
 
 
 
 
 
 
Current
519.5

 
—

 
—

 
519.5

Non-current
155.2

 
—

 
(0.1
)
 
155.3

Mortgage and other asset backed securities
 
 
 
 
 
 
 
Current
—

 
—

 
—

 
—

Non-current
131.4

 
—

 
(0.1
)
 
131.5

Total marketable debt securities
$
1,245.9

 
$
0.4

 
$
(0.3
)
 
$
1,245.8

Marketable equity securities, non-current
$
11.2

 
$
8.7

 
$
—

 
$
2.5
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 within cash and cash equivalents on the accompanying condensed consolidated balance sheet:
(In millions)
As of
September 30,
2014
 
As of
December 31,
2013
Commercial paper
$
19.4

 
$
1.2

Overnight reverse repurchase agreements
209.2

 
22.4

Short-term debt securities
434.7

 
401.1

Total
$
663.3

 
$
424.7
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, 2014
 
As of December 31, 2013
(In millions)
Estimated
Fair Value
 
Amortized
Cost
 
Estimated
Fair Value
 
Amortized
Cost
Due in one year or less
$
675.1

 
$
675.0

 
$
620.2

 
$
620.2

Due after one year through five years
1,262.0

 
1,261.8

 
573.1

 
572.9

Due after five years
109.3

 
109.1

 
52.6

 
52.7

Total available-for-sale securities
$
2,046.4

 
$
2,045.9

 
$
1,245.9

 
$
1,245.8
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)
2014
 
2013
 
2014
 
2013
Proceeds from maturities and sales
$
625.4

 
$
617.5

 
$
1,942.9

 
$
5,025.2

Realized gains
$
—

 
$
0.2

 
$
0.4

 
$
6.6

Realized losses
$
(0.1
)
 
$
—

 
$
(0.3
)
 
$
(2.1
)