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Financial Instruments (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Marketable Debt and Equity Securities |  |
Fair Value | $ 1,245.9 | $ 3,171.7
Gross Unrealized Gains | 0.4 | 5.6
Gross Unrealized Losses | (0.3) | (1.9)
Amortized Cost | 1,245.8 | 3,168.0
Corporate debt securities Current |  |
Marketable Debt and Equity Securities |  |
Fair Value | 100.7 | 346.9
Gross Unrealized Gains | 0 | 0.3
Gross Unrealized Losses | 0 | 0
Amortized Cost | 100.7 | 346.6
Corporate debt securities Non-current |  |
Marketable Debt and Equity Securities |  |
Fair Value | 339.1 | 654.1
Gross Unrealized Gains | 0.4 | 2.8
Gross Unrealized Losses | (0.1) | (0.6)
Amortized Cost | 338.8 | 651.9
Government securities Current |  |
Marketable Debt and Equity Securities |  |
Fair Value | 519.5 | 783.4
Gross Unrealized Gains | 0 | 0.3
Gross Unrealized Losses | 0 | 0
Amortized Cost | 519.5 | 783.1
Government securities Non-current |  |
Marketable Debt and Equity Securities |  |
Fair Value | 155.2 | 874.4
Gross Unrealized Gains | 0 | 0.8
Gross Unrealized Losses | (0.1) | 0
Amortized Cost | 155.3 | 873.6
Mortgage and other asset backed securities Current |  |
Marketable Debt and Equity Securities |  |
Fair Value | 0 | 4.8
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Amortized Cost | 0 | 4.8
Mortgage and other asset backed securities Non-current |  |
Marketable Debt and Equity Securities |  |
Fair Value | 131.4 | 508.1
Gross Unrealized Gains | 0 | 1.4
Gross Unrealized Losses | (0.1) | (1.3)
Amortized Cost | 131.5 | 508.0
Marketable equity securities |  |
Marketable Debt and Equity Securities |  |
Fair Value | 11.2 | 9.0
Gross Unrealized Gains | 8.7 | 3.0
Gross Unrealized Losses | 0 | 0
Amortized Cost | $ 2.5 | $ 6.0

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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 This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Equity securities categorized neither as held-to-maturity nor trading which are intended be sold more than one year from the balance sheet date or operating cycle, if longer. + 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 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 + Details
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- Definition Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities. + 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 of unrealized loss before deducting unrealized gain on investments in available-for-sale securities. + 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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