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Income Taxes - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Income Taxes [Line Items]          
Effective tax rate   4.40% 90.60% 22.40%  
Earnings of foreign entities $ 14.5 $ (0.2) $ 37.0 $ 10.2  
Positive impact of valuation allowance on effective tax rate, valuation allowance released     1.4    
Release of an Accrued Tax Liability 1.6   1.6    
Positive impact of uncertain tax positions on effective tax rate 1.0 3.1 1.0 3.1  
Unrecognized tax benefit 14.0   14.0   4.0
Accrued interest and penalties related to income tax liabilities 1.8   1.8   1.5
Decrease in unrecognized tax benefits due to expiration of statutes of limitations and settlement of various audits 0.5   0.5    
S1 Corporation
          
Income Taxes [Line Items]          
Increase in unrecognized tax benefits for uncertain tax positions     $ 10.9