Annual report pursuant to Section 13 and 15(d)

Provision for Income Taxes Reconciles with U.S. Federal Statutory Rate (Parenthetical) (Detail)

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Provision for Income Taxes Reconciles with U.S. Federal Statutory Rate (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Reconciliation of Statutory Federal Tax Rate [Line Items]      
Income Tax Reconciliation Acquisition Related Transaction Costs $ 15.3 $ (15.3) [1] $ 20.5 [1]
International Tax Restructuring $ 20.5 $ 20.5 [2]  
[1] During the fourth quarter of 2012, we recorded a $15.3 million tax benefit as a result of tax authorities approving a tax method change which impacted the tax expense recorded in connection with the merger of our Brazilian business in the second quarter of 2011.
[2] During the fourth quarter of 2012, we completed an international tax restructuring resulting in the recognition of tax expense of $20.5 million.