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Reconciliation of Beginning and Ending Amounts of Unrecognized Tax Benefits (Table Footnotes) (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
Unrecognized tax benefits $ 1,342.8 $ 1,180.4 [1] $ 924.1
Other Current Liabilities [Member]      
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
Unrecognized tax benefits 12.5 30.8  
Other long-term liabilities      
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
Unrecognized tax benefits $ 1,313.7 $ 1,132.3  
[1] Of this amount, $1,313.7 million and $1,132.3 million are included in Other long-term liabilities for 2018 and 2017, respectively, and $12.5 million and $30.8 million are included in Prepaid expenses and other current assets for 2018 and 2017, respectively, on the Consolidated Balance Sheet. The remainder is included in Deferred income taxes on the Consolidated Balance Sheet.