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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2013
Summary of Significant Accounting Policies  
Schedule of client commission arrangement

Client commissions allocated for research and related prepaid and accrued research balances for the years ended December 31, 2013, 2012 and 2011 were as follows (dollars in millions):

 
   2013   2012   2011  

Client commissions

   $ 122.8   $ 112.1   $ 130.8  
               
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Prepaid research, gross

   $ 4.5   $ 5.1   $ 3.7  

Allowance for prepaid research

     (0.2 )   (0.4 )   (0.4 )
               
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Prepaid research, net of allowance

   $ 4.3   $ 4.7   $ 3.3  
               
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Accrued research payable

   $ 52.0   $ 38.6   $ 50.7  
               
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