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Consolidated Investment Products (CIP) - Narrative (Details)
3 Months Ended
Mar. 31, 2021
USD ($)
entity
Mar. 31, 2020
USD ($)
entity
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Variable Interest Entity [Line Items]        
Number of entities no longer consolidated | entity 5 5    
Number of deconsolidated voting right entities | entity 3 9    
Pay interest at Libor or Euribor plus (percent) 11.00%      
Collateral assets in default (percent) 0.85%      
Weighted average maturity (years) 10 years 2 months 19 days      
Notes issued by collateralized loan obligations terms of arrangements interest rate margin spread low 0.40%      
Notes issued by collateralized loan obligations terms of arrangements interest rate margin spread high 8.07%      
Investments of CIP $ 7,912,100,000   $ 7,910,000,000.0  
De-consolidated        
Variable Interest Entity [Line Items]        
Carrying value and maximum risk of loss with respect to VIEs in which the Company is not primary beneficiary 150,900,000   152,000,000.0  
Gain (loss) on deconsolidation 0      
Investments of CIP $ 284,400,000 $ 127,300,000    
Consolidated        
Variable Interest Entity [Line Items]        
Number of consolidated VIEs | entity 5 3    
Number of consolidated voting right entities | entity 3 0    
Investments of CIP $ 7,912,100,000   7,910,000,000.0  
Bank loans        
Variable Interest Entity [Line Items]        
CLO Collateral Assets 6,679,600,000      
Bank loans | Consolidated        
Variable Interest Entity [Line Items]        
CLO Collateral Assets 6,696,400,000   6,864,500,000  
Senior Secured Bank Loans And Bonds        
Variable Interest Entity [Line Items]        
Fair value, option, aggregate differences, long-term debt instruments 87,100,000   208,600,000  
Significant Unobservable Inputs (Level 3)        
Variable Interest Entity [Line Items]        
Gains and losses included in the Condensed Consolidated Statements of Income   $ 10,800,000    
Real Estate Investments, Net   $ 89,400,000   $ 78,600,000
Significant Unobservable Inputs (Level 3) | Consolidated        
Variable Interest Entity [Line Items]        
Investments of CIP 0   0  
Significant Unobservable Inputs (Level 3) | Bank loans | Consolidated        
Variable Interest Entity [Line Items]        
CLO Collateral Assets $ 0   $ 0