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Income Taxes (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Gain on sale of portion of Facebook | $ 93.6 |  |  |  |
One hundred percent valuation allowance |  | 100.00% |  |  |
Operating loss carryforwards |  | 1,407.1 |  |  |
Undistributed foreign earnings | 2,110.0 | 1,959.8 | 2,110.0 |  |
Unrecognized tax benefits | 194.6 | 219.2 | 194.6 | 161.0 | 146.7
Unrecognized tax benefits that would impact effective tax rate |  | 207.9 |  |  |
Income tax penalties and interest accrued | 13.5 | 11.9 | 13.5 |  |
Income tax penalties and interest expense |  | 2.8 | (1.4) |  |
Estimated unrecognized tax benefit decrease, lower bound |  | 10.0 |  |  |
Estimated unrecognized tax benefit decrease, upper bound |  | 20.0 |  |  |
Tax contingency reserve adjustment |  |  | 19.5 |  |
Domestic country | Minimum |  |  |  |  |
Income tax examination year |  | 2007 |  |  |
Open tax years |  | 2009 |  |  |
Domestic country | Maximum |  |  |  |  |
Income tax examination year |  | 2008 |  |  |
State and local jurisdiction | Minimum |  |  |  |  |
Open tax years |  | 1999 |  |  |
Foreign country |  |  |  |  |
Operating loss carryforwards, no expiration |  | 1,147.2 |  |  |
Operating loss carryforwards, subject to expiration |  | 259.9 |  |  |
Foreign country | Minimum |  |  |  |  |
Operating loss carryforwards, expiration date |  | Jan. 01, 2014 |  |  |
Open tax years |  | 2005 |  |  |
Foreign country | Maximum |  |  |  |  |
Operating loss carryforwards, expiration date |  | Jan. 01, 2032 |  |  |
Continental Europe |  |  |  |  |
Reversal of valuation allowance |  |  | (21.8) |  |
Asia Pacific |  |  |  |  |
Reversal of valuation allowance |  |  | $ (26.2) |  |

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- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary differences from undistributed earnings of subsidiaries and other recognized entities not within the country of domicile of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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