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Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2015
Investments, Debt and Equity Securities [Abstract] |
Marketable debt and equity securities | The following tables summarize our marketable debt and equity securities:
As of June 30, 2015 (In millions) | Fair Value |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Amortized Cost
Available-for-sale: |  |  |  |  |  |  |
Corporate debt securities |  |  |  |  |  |  |
Current | $ | 375.9 |  |  | $ | 0.1 |  |  | $ | (0.1 | ) |  | $ | 375.9 |
Non-current | 822.2 |  |  | 0.4 |  |  | (1.2 | ) |  | 823.0 |
Government securities |  |  |  |  |  |  |
Current | 710.5 |  |  | 0.1 |  |  | (0.1 | ) |  | 710.5 |
Non-current | 989.8 |  |  | 0.9 |  |  | (0.1 | ) |  | 989.0 |
Mortgage and other asset backed securities |  |  |  |  |  |  |
Current | 0.2 |  |  | — |  |  | — |  |  | 0.2 |
Non-current | 289.8 |  |  | 0.2 |  |  | (0.3 | ) |  | 289.9 |
Total marketable debt securities | $ | 3,188.4 |  |  | $ | 1.7 |  |  | $ | (1.8 | ) |  | $ | 3,188.5 |
Marketable equity securities, non-current | $ | 6.8 |  |  | $ | 1.1 |  |  | $ | — |  |  | $ | 5.7 |
As of December 31, 2014 (In millions) | Fair Value |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Amortized Cost
Available-for-sale: |  |  |  |  |  |  |
Corporate debt securities |  |  |  |  |  |  |
Current | $ | 370.4 |  |  | $ | — |  |  | $ | (0.2 | ) |  | $ | 370.6 |
Non-current | 692.6 |  |  | 0.2 |  |  | (1.5 | ) |  | 693.9 |
Government securities |  |  |  |  |  |  |
Current | 269.9 |  |  | — |  |  | (0.1 | ) |  | 270.0 |
Non-current | 579.9 |  |  | 0.3 |  |  | (0.4 | ) |  | 580.0 |
Mortgage and other asset backed securities |  |  |  |  |  |  |
Current | 0.2 |  |  | — |  |  | — |  |  | 0.2 |
Non-current | 198.1 |  |  | 0.2 |  |  | (0.2 | ) |  | 198.1 |
Total marketable debt securities | $ | 2,111.1 |  |  | $ | 0.7 |  |  | $ | (2.4 | ) |  | $ | 2,112.8 |
Marketable equity securities, non-current | $ | 6.9 |  |  | $ | 1.2 |  |  | $ | (0.2 | ) |  | $ | 5.9 |
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 June 30, 2015 |  | As of December 31, 2014
Commercial paper | $ | 38.8 |  |  | $ | 54.2 |
Overnight reverse repurchase agreements | 185.0 |  |  | 305.0 |
Money market funds | 740.2 |  |  | 321.2 |
Short-term debt securities | 10.0 |  |  | 35.9 |
Total | $ | 974.0 |  |  | $ | 716.3 |
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 June 30, 2015 |  | As of December 31, 2014
(In millions) | Estimated Fair Value |  | Amortized Cost |  | Estimated Fair Value |  | Amortized Cost
Due in one year or less | $ | 1,086.6 |  |  | $ | 1,086.6 |  |  | $ | 640.5 |  |  | $ | 640.8 |
Due after one year through five years | 1,954.4 |  |  | 1,954.5 |  |  | 1,343.7 |  |  | 1,345.2 |
Due after five years | 147.4 |  |  | 147.4 |  |  | 126.9 |  |  | 126.8 |
Total available-for-sale securities | $ | 3,188.4 |  |  | $ | 3,188.5 |  |  | $ | 2,111.1 |  |  | $ | 2,112.8 |
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 June 30, |  | For the Six Months Ended June 30,
(In millions) | 2015 |  | 2014 |  | 2015 |  | 2014
Proceeds from maturities and sales | $ | 601.9 |  |  | $ | 560.1 |  |  | $ | 975.5 |  |  | $ | 1,317.5 |
Realized gains | $ | 0.3 |  |  | $ | 0.2 |  |  | $ | 0.5 |  |  | $ | 0.4 |
Realized losses | $ | (0.5 | ) |  | $ | (0.1 | ) |  | $ | (0.8 | ) |  | $ | (0.2 | )

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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