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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2010
Income Taxes [Line Items]        
Operating loss carryforwards $ 1,500.0      
Unrecognized tax benefits 781.2 [1] $ 988.1 [1] $ 512.7  
Reasonably possible amount of unrecognized tax benefits decrease within the next 12 months - minimum       $ 250.0
Effective tax rate adjustment 470.0      
Accrued interest and penalties related to income tax matters 83.6 119.0    
Provision for income taxes, interest and penalties expense related to tax matters 21.1 $ 87.9 $ 14.4  
Temporary difference for which deferred U.S. income taxes have not been recorded 14,900.0      
Minimum        
Income Taxes [Line Items]        
Effective tax rate adjustment       $ 50.0
Indefinite [Member]        
Income Taxes [Line Items]        
Operating loss carryforwards $ 1,200.0      
[1] Of this amount, $704.0 million and $909.0 million are included in Other long-term liabilities for 2015 and 2014, respectively, and $21.9 million and $19.5 million are included in Current liabilities - income taxes for 2015 and 2014, respectively, on the Consolidated balance sheet. The remainder is included in Deferred income taxes on the Consolidated balance sheet.