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Regulatory Requirements Regulatory (Tables)
 9 Months Ended
Sep. 30, 2017
Regulatory [Abstract]  
Computation of Net Capital under Securities and Exchange Commission Regulation [Table Text Block]
Subsidiary
 
Net Capital
 
Minimum Net Capital Requirement
 
Excess Net Capital
 
 
(dollars in millions)
Cowen and Company
 
$
83.4

 
$
1.0

 
$
82.4

Cowen Execution
 
$
104.9

 
$
1.4

 
$
103.5

ATM Execution
 
$
2.0

 
$
0.3

 
$
1.7

Cowen Prime
 
$
10.9

 
$
0.3

 
$
10.6

Westminster Research
 
$
12.0

 
$
0.3

 
$
11.7

Ramius UK
 
$
0.2

 
$
0.1

 
$
0.1

Cowen International Limited
 
$
11.4

 
$
6.0

 
$
5.4

Cowen Execution Services Ltd
 
$
3.9

 
$
2.0

 
$
1.9