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Net Capital Requirement (Tables)
12 Months Ended
Dec. 31, 2011
Net Capital Requirement  
Net capital balances and the amounts in excess of required net capital for the U.S. Operations
 
  Net Capital   Excess Net Capital  

U.S. Operations

             

ITG Inc. 

  $ 100.8   $ 99.8  

AlterNet

    4.4     4.2  

Blackwatch

    2.7     2.7  

ITG Derivatives

    3.5     2.5  
Net capital balances and the amounts in excess of required net capital for other than U.S. Operations
 
  Net Capital   Excess Net Capital  

Canadian Operations

             

Canada

  $ 43.7   $ 43.2  

European Operations

             

Europe

    41.6     22.8  

Asia Pacific Operations

             

Australia

    7.7     3.5  

Hong Kong

    28.6     17.2  

Singapore

    0.4     0.2