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Financial Instruments (Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Marketable Debt and Equity Securities |  |
Fair Value | $ 1,720.6 | $ 1,245.9
Gross Unrealized Gains | 1.1 | 0.4
Gross Unrealized Losses | (0.4) | (0.3)
Amortized Cost | 1,719.9 | 1,245.8
Corporate debt securities Current |  |
Marketable Debt and Equity Securities |  |
Fair Value | 125.0 | 100.7
Gross Unrealized Gains | 0.1 | 0
Gross Unrealized Losses | 0 | 0
Amortized Cost | 124.9 | 100.7
Corporate debt securities Non-current |  |
Marketable Debt and Equity Securities |  |
Fair Value | 492.2 | 339.1
Gross Unrealized Gains | 0.6 | 0.4
Gross Unrealized Losses | (0.2) | (0.1)
Amortized Cost | 491.8 | 338.8
Government securities Current |  |
Marketable Debt and Equity Securities |  |
Fair Value | 584.9 | 519.5
Gross Unrealized Gains | 0.1 | 0
Gross Unrealized Losses | (0.1) | 0
Amortized Cost | 584.9 | 519.5
Government securities Non-current |  |
Marketable Debt and Equity Securities |  |
Fair Value | 363.1 | 155.2
Gross Unrealized Gains | 0.2 | 0
Gross Unrealized Losses | 0 | (0.1)
Amortized Cost | 362.9 | 155.3
Mortgage and other asset backed securities Current |  |
Marketable Debt and Equity Securities |  |
Fair Value | 0 | 0
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Amortized Cost | 0 | 0
Mortgage and other asset backed securities Non-current |  |
Marketable Debt and Equity Securities |  |
Fair Value | 155.4 | 131.4
Gross Unrealized Gains | 0.1 | 0
Gross Unrealized Losses | (0.1) | (0.1)
Amortized Cost | 155.4 | 131.5
Marketable equity securities |  |
Marketable Debt and Equity Securities |  |
Fair Value | 0.4 | 11.2
Gross Unrealized Gains | 0 | 8.7
Gross Unrealized Losses | (0.1) | 0
Amortized Cost | $ 0.5 | $ 2.5

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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