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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
Accounting Policies [Abstract]  
Schedule of client commission arrangement

Client commissions allocated for research and related research receivable and accrued research payable balances for the years ended December 31, 2017, 2016 and 2015 were as follows (dollars in millions):

 

 

 

 

 

 

 

 

 

 

 

 

    

2017

    

2016

    

2015

 

Client commissions allocated for research

 

$

96.3

 

$

100.7

 

$

110.9

 

Research receivable, gross

 

$

5.3

 

$

3.0

 

$

3.5

 

Allowance for research receivable

 

 

(0.1)

 

 

(0.1)

 

 

(0.1)

 

Research receivable, net of allowance

 

$

5.2

 

$

2.9

 

$

3.4

 

Accrued research payable

 

$

51.3

 

$

45.8

 

$

46.3