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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Taxes [Line Items]      
Document Period End Date Dec. 31, 2019    
Operating loss carryforwards $ 360.3    
Unrecognized tax benefits 1,439.1 [1] $ 1,342.8 [1] $ 1,180.4
Reasonably possible amount of unrecognized tax benefits decrease within the next 12 months - minimum 980.0    
Effective tax rate adjustment 880.0    
Accrued interest and penalties related to income tax matters 174.4 152.0  
Provision for income taxes, interest and penalties expense related to tax matters $ 39.9 13.9 34.9
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Liability, Noncurrent     1,200.0
Adjustments to Provisional Amounts Recorded at December 31, 2017 (Tax Cuts and Jobs Act of 2017)   $ 75.0  
US net deferred tax liability remeasurement, amount     $ 500.0
Statutory U.S. federal income tax rate 21.00% 21.00% 35.00%
Indefinite [Member]      
Income Taxes [Line Items]      
Operating loss carryforwards $ 232.7    
[1]
Of this amount, $1,285.3 million and $1,313.7 million are included in Long-term income taxes for 2019 and 2018, respectively, and $138.8 million and $12.5 million are included in Prepaid expenses and other current assets for 2019 and 2018, respectively, on the Consolidated Balance Sheet. The remainder is included in Deferred income taxes on the Consolidated Balance Sheet.