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Income Taxes - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Income Taxes [Line Items]          
Effective tax rate 57.10% 6.70% 51.00% 34.00%  
Earnings of foreign entities $ 12.8 $ 10.2 $ 22.5 $ 10.4  
Positive impact of valuation allowance on effective tax rate 1.4        
Positive impact of uncertain tax positions on effective tax rate   3.9   3.9  
Reversal of deferred tax assets   1.7   1.7  
Unrecognized tax benefit 22.5   22.5   4.0
Accrued interest and penalties related to income tax liabilities 1.9   1.9   1.5
Decrease in unrecognized tax benefits due to the expiration of statutes of limitations and the settlement of various audits 1.4   1.4    
S1 Corporation
          
Income Taxes [Line Items]          
Increase in unrecognized tax benefits for uncertain tax positions     $ 18.4