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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)