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Financial Instruments (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Marketable Debt and Equity Securities
Fair Value	$ 2,046.4	$ 1,245.9
Gross Unrealized Gains	1.4	0.4
Gross Unrealized Losses	(0.9)	(0.3)
Amortized Cost	2,045.9	1,245.8
Corporate debt securities Current
Marketable Debt and Equity Securities
Fair Value	196.3	100.7
Gross Unrealized Gains	0.1	0
Gross Unrealized Losses	0	0
Amortized Cost	196.2	100.7
Corporate debt securities Non-current
Marketable Debt and Equity Securities
Fair Value	578.1	339.1
Gross Unrealized Gains	0.6	0.4
Gross Unrealized Losses	(0.6)	(0.1)
Amortized Cost	578.1	338.8
Government securities Current
Marketable Debt and Equity Securities
Fair Value	478.7	519.5
Gross Unrealized Gains	0.1	0
Gross Unrealized Losses	0	0
Amortized Cost	478.6	519.5
Government securities Non-current
Marketable Debt and Equity Securities
Fair Value	606.3	155.2
Gross Unrealized Gains	0.4	0
Gross Unrealized Losses	(0.2)	(0.1)
Amortized Cost	606.1	155.3
Mortgage and other asset backed securities Current
Marketable Debt and Equity Securities
Fair Value	0.1	0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Amortized Cost	0.1	0
Mortgage and other asset backed securities Non-current
Marketable Debt and Equity Securities
Fair Value	186.9	131.4
Gross Unrealized Gains	0.2	0
Gross Unrealized Losses	(0.1)	(0.1)
Amortized Cost	186.8	131.5
Marketable equity securities
Marketable Debt and Equity Securities
Fair Value	0.7	11.2
Gross Unrealized Gains	0.2	8.7
Gross Unrealized Losses	0	0
Amortized Cost	$ 0.5	$ 2.5

X

- 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

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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-Publisher FASB

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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

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