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Reconciliation of Beginning and Ending Amounts of Unrecognized Tax Benefits (Table Footnotes) (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
Unrecognized tax benefits $ 781.2 [1] $ 988.1 [1] $ 512.7
Other long-term liabilities      
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
Unrecognized tax benefits 704.0 909.0  
Other Current Liabilities [Member]      
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
Unrecognized tax benefits $ 21.9 $ 19.5  
[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.