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Income Tax Matters, Textuals (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Income Tax Examination [Line Items]          
Income tax provision $ 10.3 $ 18.2 $ 30.2 $ 47.7  
Effective tax rate 28.90% 38.40% 28.10% 38.40%  
Increase in unrecognized tax benefits, including interest and penalties   0.3   0.7  
Increase in effective tax rate due to unrecognized tax benefits, including interest and penalties   0.70%   0.60%  
Gross unrecognized tax benefits 6.9   6.9   15.7
Gross unrecognized tax benefits that would impact effective tax rate 5.8   5.8   14.6
Reduction in gross unrecognized tax benefits 3.0   3.0    
Period which gross unrecognized tax benefits are expected to be reduced 12 months   12 months    
Audit Settlement & Advanced Pricing Agreement
         
Income Tax Examination [Line Items]          
Refund adjustment from settlement with Canada Revenue Agency Competent Authority 10.7   10.7    
Advanced Pricing Agreement
         
Income Tax Examination [Line Items]          
Decrease in effective tax rate due to bilateral Advanced Pricing Agreement 2.7   2.7    
Decrease in effective tax rate, percent (7.70%)   (2.50%)    
Refund adjustment from settlement with Canada Revenue Agency Competent Authority 2.9   2.9    
Audit settlement with the Canada Revenue Agency Competent Authority
         
Income Tax Examination [Line Items]          
Decrease in effective tax rate, percent     (7.10%)    
Decrease in unrecognized tax benefits due to an audit settlement with the Canada Revenue Agency Competent Authority     $ 7.7