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Equity-based Compensation - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Feb. 28, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares reserved for future issuance (in shares) 21,000,000.0      
Unrecognized share based compensation expense $ 11,300,000      
Unrecognized share based compensation expense recognition period 2 years      
Compensation costs to be recognized next year $ 700,000      
Stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 5 years 5 years    
Risk-free interest rate 2.60% 2.50%    
Expected volatility rate 28.40% 28.30%    
Options granted fair value $ 5,100,000 $ 11,700,000    
Fair value options vested $ 4,300,000 $ 2,300,000    
Weighed average fair value (in dollars per share) $ 2.48 $ 1.69    
OM Asset Management Equity Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense $ 5,800,000 $ 7,100,000 $ 14,600,000  
Income tax benefit $ 500,000 $ 1,300,000 $ 5,700,000  
OM Asset Management Equity Incentive Plan | Restricted shares (RSA) | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 1 year      
OM Asset Management Equity Incentive Plan | Restricted shares (RSA) | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 3 years      
OM Asset Management Equity Incentive Plan | Restricted Stock Units (RSUs) | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 1 year      
OM Asset Management Equity Incentive Plan | Restricted Stock Units (RSUs) | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 3 years      
OM Asset Management Equity Incentive Plan | Performance-based RSAs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 3 years      
Old Mutual Compensation Plans | Restricted shares (RSA)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted during the year (in shares) 0 0 0  
Brightsphere Equity Incentive Plan | Restricted shares (RSA)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted during the year (in shares) 18,000 304,389 342,637  
Brightsphere Equity Incentive Plan | Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted during the year (in shares) 88,980 48,930 51,779  
Brightsphere Equity Incentive Plan | Performance-based RSAs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted during the year (in shares) 0 83,092 175,586  
Risk-free interest rate 2.48%      
Expected volatility rate 26.11%      
Brightsphere Equity Incentive Plan | Performance-based RSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted during the year (in shares) 9,013 0 0  
Brightsphere Equity Incentive Plan | Stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighed average fair value (in dollars per share) $ 2.48 $ 1.69 $ 0  
Landmark        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Potential additional payments (up to)       $ 207,600,000