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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2016
Accounting Policies [Abstract]  
Schedule of client commission arrangement

Client commissions allocated for research and related prepaid and accrued research balances for the years ended December 31, 2016, 2015 and 2014 were as follows (dollars in millions):

 

 

 

 

 

 

 

 

 

 

 

 

    

2016

    

2015

    

2014

 

Client commissions allocated for research

 

$
100.7

 

$
110.9

 

$
119.4

 

Prepaid research, gross

 

$
3.0

 

$
3.5

 

$
4.3

 

Allowance for prepaid research

 

 
(0.1)

 

 
(0.1)

 

 

 —

 

Prepaid research, net of allowance

 

$
2.9

 

$
3.4

 

$
4.3

 

Accrued research payable

 

$
45.8

 

$
46.3

 

$
56.7