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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Income Taxes        
Effective income tax rate (as a percent) 18.40% 30.10% 25.60% 25.30%
Number of items that significantly impact effective income tax rate 2      
Effective income tax rate excluding significant adjustments (as a percent) 30.00%   31.00% 31.00%
Income tax reconciliation, recognition of nontaxable NAFTA settlement       $ (58.4)
Unrecognized tax benefits to be recognized as a result of a lapse of the statute of limitations 4   4  
Restructuring and Asset Impairment Charges        
Restructuring and asset impairment charges 13.6 2.5 17.4 2.5
Income tax expense (benefit) 25.0 34.9 70.8 80.2
Kenya operations
       
Restructuring and Asset Impairment Charges        
Restructuring and asset impairment charges 10.0      
Income tax expense (benefit) (6.0)      
Korea
       
Restructuring and Asset Impairment Charges        
Tax benefit related to reversal of a valuation allowance $ 13