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Share-Based Compensation and Employee Ownership Plans Narrative (Details)
$ in Millions
12 Months Ended
Dec. 05, 2016
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2014
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stockholders' Equity Note, Stock Split, Conversion Ratio 0.25      
Equity Plans        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for issuance under compensation plan, in shares | shares   100,000    
Stock-compensation expense recognized in connection with compensation plan   $ 26.0 $ 21.7 $ 18.3
Tax benefit of stock-compensation expense recognized in connection with compensation plan   $ 11.4 $ 5.0 $ 6.0
Equity Plans | Employee Stock Option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options, initial term   7 years    
Equity Plans | Employee Stock Option | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock compensation award, vesting period   2 years    
Equity Plans | Employee Stock Option | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock compensation award, vesting period   5 years    
Equity Plans | Restricted Shares and Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation expense   $ 60.6    
Vested, shares | shares [1]   1,487,092 1,047,072  
Equity Plans | Restricted Stock | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock compensation award, vesting period   2 years    
Equity Plans | Restricted Stock | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock compensation award, vesting period   5 years    
Equity Plans | Stock Appreciation Rights (SARs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
SAR's, initial term   5 years    
Unrecognized compensation expense   $ 0.1 $ 0.1  
Vested, shares | shares [2]   0 0  
Deferred Cash Award | Cowen Group, Inc. 2010 Equity and Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock compensation award, vesting period   4 years    
Deferred cash awards, unrecognized compensation expense   $ 32.9    
Deferred Cash Award | Cowen Group, Inc. 2010 Equity and Incentive Plan | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Deferred cash award, interest rate   0.70%    
Deferred Cash Award | Cowen Group, Inc. 2010 Equity and Incentive Plan | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Deferred cash award, interest rate   0.75%    
[1] Share and per share amounts have been retroactively updated to reflect the one-for-four reverse stock split effective as of December 5, 2016.
[2] Share and per share amounts have been retroactively updated to reflect the one-for-four reverse stock split effective as of December 5, 2016.