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Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2016
Investments, All Other Investments [Abstract] |
Summary of financial assets with maturities of less than 90 days included within cash and cash equivalents |
| As of December 31,
(In millions) | 2016 |  | 2015
Commercial paper | $ | 31.0 |  |  | $ | 21.9 |
Overnight reverse repurchase agreements | — |  |  | 134.7 |
Money market funds | 741.7 |  |  | 673.8 |
Short-term debt securities | 1,266.9 |  |  | 79.1 |
Total | $ | 2,039.6 |  |  | $ | 909.5 |
Marketable securities including strategic investments |
As of December 31, 2016 (In millions) | Fair Value |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Amortized Cost
Corporate debt securities |  |  |  |  |  |  |
Current | $ | 1,408.6 |  |  | $ | 0.2 |  |  | $ | (0.6 | ) |  | $ | 1,409.0 |
Non-current | 1,255.2 |  |  | 1.2 |  |  | (4.7 | ) |  | 1,258.7 |
Government securities |  |  |  |  |  |  |
Current | 1,156.0 |  |  | 0.2 |  |  | (0.3 | ) |  | 1,156.1 |
Non-current | 1,016.5 |  |  | 0.5 |  |  | (3.4 | ) |  | 1,019.4 |
Mortgage and other asset backed securities |  |  |  |  |  |  |
Current | 4.0 |  |  | — |  |  | — |  |  | 4.0 |
Non-current | 557.7 |  |  | 0.8 |  |  | (2.2 | ) |  | 559.1 |
Total marketable debt securities | $ | 5,398.0 |  |  | $ | 2.9 |  |  | $ | (11.2 | ) |  | $ | 5,406.3 |
Marketable equity securities, non-current | $ | 24.9 |  |  | $ | 0.7 |  |  | $ | (9.3 | ) |  | $ | 33.5 |
As of December 31, 2015 (In millions) | Fair Value |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Amortized Cost
Corporate debt securities |  |  |  |  |  |  |
Current | $ | 394.3 |  |  | $ | — |  |  | $ | (0.5 | ) |  | $ | 394.8 |
Non-current | 1,116.6 |  |  | 0.1 |  |  | (4.1 | ) |  | 1,120.6 |
Government securities |  |  |  |  |  |  |
Current | 1,723.4 |  |  | 0.1 |  |  | (1.1 | ) |  | 1,724.4 |
Non-current | 1,152.5 |  |  | — |  |  | (3.1 | ) |  | 1,155.6 |
Mortgage and other asset backed securities |  |  |  |  |  |  |
Current | 2.8 |  |  | — |  |  | — |  |  | 2.8 |
Non-current | 491.3 |  |  | 0.1 |  |  | (1.8 | ) |  | 493.0 |
Total marketable debt securities | $ | 4,880.9 |  |  | $ | 0.3 |  |  | $ | (10.6 | ) |  | $ | 4,891.2 |
Marketable equity securities, non-current | $ | 37.5 |  |  | $ | 9.2 |  |  | $ | — |  |  | $ | 28.3 |
Summary of contractual maturities: Available-for-sale securities |
| As of December 31, 2016 |  | As of December 31, 2015
(In millions) | Estimated Fair Value |  | Amortized Cost |  | Estimated Fair Value |  | Amortized Cost
Due in one year or less | $ | 2,568.6 |  |  | $ | 2,569.1 |  |  | $ | 2,120.5 |  |  | $ | 2,122.0 |
Due after one year through five years | 2,552.6 |  |  | 2,559.7 |  |  | 2,575.9 |  |  | 2,583.9 |
Due after five years | 276.8 |  |  | 277.5 |  |  | 184.5 |  |  | 185.3 |
Total available-for-sale securities | $ | 5,398.0 |  |  | $ | 5,406.3 |  |  | $ | 4,880.9 |  |  | $ | 4,891.2 |
Proceeds from marketable securities, excluding strategic investments |
| For the Years Ended December 31,
(In millions) | 2016 |  | 2015 |  | 2014
Proceeds from maturities and sales | $ | 7,378.9 |  |  | $ | 4,063.0 |  |  | $ | 2,718.9 |
Realized gains | $ | 3.3 |  |  | $ | 1.5 |  |  | $ | 0.7 |
Realized losses | $ | 4.3 |  |  | $ | 3.5 |  |  | $ | 0.5 |

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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=73527792&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=73527792&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=73527792&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=73527792&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=73527792&loc=d3e27290-111563 + Details
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