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Reconciliation of Beginning and Ending Amounts of Unrecognized Tax Benefits (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
Unrecognized tax benefits $ 482.4 [1] $ 565.0 [1] $ 572.6
Other long-term liabilities
     
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
Unrecognized tax benefits $ 481.7 $ 564.3  
[1] Of this amount, $481.7 million and $564.3 million are included in long-term liabilities on the Consolidated balance sheet for 2012 and 2011, respectively. The remainder is included in deferred income taxes on the Consolidated balance sheet.