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Reconciliation of Beginning and Ending Amounts of Unrecognized Tax Benefits (Table Footnotes) (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Taxes [Line Items]      
Unrecognized tax benefits $ 1,479.2 [1] $ 1,439.1 [1] $ 1,342.8
Long-term income taxes      
Income Taxes [Line Items]      
Unrecognized tax benefits 1,137.8 1,285.3  
Prepaid expenses and other current assets      
Income Taxes [Line Items]      
Unrecognized tax benefits $ 325.0 $ 138.8  
[1] Of this amount, $1,137.8 million and $1,285.3 million are included in Long-term income taxes for 2020 and 2019, respectively, and $325.0 million and $138.8 million are included in Prepaid expenses and other current assets for 2020 and 2019, respectively, on the Consolidated Balance Sheet. The remainder is included in Deferred income taxes on the Consolidated Balance Sheet.