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Reconciliation of Beginning and Ending Amounts of Unrecognized Tax Benefits (Table Footnotes) (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
Unrecognized tax benefits $ 1,180.4 $ 924.1 [1] $ 781.2
Other Current Liabilities [Member]      
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
Unrecognized tax benefits 30.8 9.0  
Other long-term liabilities      
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
Unrecognized tax benefits $ 1,132.3 $ 890.0  
[1] Of this amount, $1,132.3 million and $890.0 million are included in Other long-term liabilities for 2017 and 2016, respectively, and $30.8 million and $9.0 million are included in Current liabilities - income taxes for 2017 and 2016, respectively, on the consolidated balance sheet. The remainder is included in Deferred income taxes on the consolidated balance sheet.