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Fair Value Measurement - Summary of Quantitative Information about Level III Inputs (Details)
$ in Millions
Sep. 30, 2022
USD ($)
$ / shares
Dec. 31, 2021
USD ($)
$ / shares
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of assets $ 7,098.7 $ 7,003.8
Fair value of liabilities 5,333.2 5,811.7
Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of assets 6,691.6 6,955.3
Fair value of liabilities 5,303.7 5,811.0
Senior secured notes | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of liabilities 5,085.8 5,561.1
Investments of Consolidated Funds | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of assets 6,127.4 6,515.5
Equity securities | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of assets 56.3  
Consensus Pricing | Equity securities | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of assets 10.4 17.9
Consensus Pricing | Bonds | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of assets 560.8 599.5
Consensus Pricing | Loans | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of assets $ 4,853.1 $ 5,766.0
Consensus Pricing | Indicative Quotes | Minimum | Equity securities | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.00 0.00
Consensus Pricing | Indicative Quotes | Minimum | Bonds | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 55 0.93
Consensus Pricing | Indicative Quotes | Minimum | Loans | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0 0.35
Consensus Pricing | Indicative Quotes | Maximum | Equity securities | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 17.00 84.22
Consensus Pricing | Indicative Quotes | Maximum | Bonds | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 1.25 1.07
Consensus Pricing | Indicative Quotes | Maximum | Loans | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 1.03 1.06
Consensus Pricing | Indicative Quotes | Weighted Average | Equity securities | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.43 0.63
Consensus Pricing | Indicative Quotes | Weighted Average | Bonds | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.89 0.99
Consensus Pricing | Indicative Quotes | Weighted Average | Loans | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.93 0.98
Discounted Cash Flow | Equity securities | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of assets $ 445.2  
Discounted Cash Flow | Loans | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of assets 24.0 $ 65.1
Discounted Cash Flow | Aviation subordinated notes | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of assets $ 3.4 $ 6.1
Discounted Cash Flow | Discount Rates | Minimum | Equity securities | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.09  
Discounted Cash Flow | Discount Rates | Minimum | Loans | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.09 0.04
Discounted Cash Flow | Discount Rates | Minimum | Aviation subordinated notes | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.22 0.18
Discounted Cash Flow | Discount Rates | Maximum | Equity securities | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.10  
Discounted Cash Flow | Discount Rates | Maximum | Loans | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.12 0.08
Discounted Cash Flow | Discount Rates | Maximum | Aviation subordinated notes | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.22 0.18
Discounted Cash Flow | Discount Rates | Weighted Average | Equity securities | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.09  
Discounted Cash Flow | Discount Rates | Weighted Average | Loans | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.10 0.05
Discounted Cash Flow | Discount Rates | Weighted Average | Aviation subordinated notes | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.22 0.18
Market Yield Analysis | Loans | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of assets $ 61.3 $ 67.0
Market Yield Analysis | BDC preferred shares | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of assets $ 61.2 $ 72.5
Market Yield Analysis | Market Yield | Minimum | Loans | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input | $ / shares 0.98 0.03
Market Yield Analysis | Market Yield | Minimum | BDC preferred shares | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.07 0.07
Market Yield Analysis | Market Yield | Maximum | Loans | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input | $ / shares 0.98 0.08
Market Yield Analysis | Market Yield | Maximum | BDC preferred shares | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.07 0.07
Market Yield Analysis | Market Yield | Weighted Average | Loans | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input | $ / shares 0.98 0.05
Market Yield Analysis | Market Yield | Weighted Average | BDC preferred shares | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.07 0.07
Consensus Pricing with Discounted Cash Flow | Subordinated notes and preferred shares | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of liabilities $ 217.9 $ 249.9
Consensus Pricing with Discounted Cash Flow | Senior secured notes | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of assets 430.7 289.7
Consensus Pricing with Discounted Cash Flow | Subordinated notes and preferred shares | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of assets $ 68.9 $ 71.5
Consensus Pricing with Discounted Cash Flow | Indicative Quotes | Minimum | Subordinated notes and preferred shares | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Liabilities, measurement input 0.19 0.40
Consensus Pricing with Discounted Cash Flow | Indicative Quotes | Minimum | Senior secured notes | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.74 0.86
Consensus Pricing with Discounted Cash Flow | Indicative Quotes | Minimum | Subordinated notes and preferred shares | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.21 0.46
Consensus Pricing with Discounted Cash Flow | Indicative Quotes | Maximum | Subordinated notes and preferred shares | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Liabilities, measurement input 1.03 0.97
Consensus Pricing with Discounted Cash Flow | Indicative Quotes | Maximum | Senior secured notes | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 1 1.01
Consensus Pricing with Discounted Cash Flow | Indicative Quotes | Maximum | Subordinated notes and preferred shares | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.66 0.97
Consensus Pricing with Discounted Cash Flow | Indicative Quotes | Weighted Average | Subordinated notes and preferred shares | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Liabilities, measurement input 0.43 0.61
Consensus Pricing with Discounted Cash Flow | Indicative Quotes | Weighted Average | Senior secured notes | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.95 0.99
Consensus Pricing with Discounted Cash Flow | Indicative Quotes | Weighted Average | Subordinated notes and preferred shares | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.49 0.63
Consensus Pricing with Discounted Cash Flow | Discount Margins | Minimum | Senior secured notes | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.0155 0.0050
Consensus Pricing with Discounted Cash Flow | Discount Margins | Maximum | Senior secured notes | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.1700 0.1330
Consensus Pricing with Discounted Cash Flow | Discount Margins | Weighted Average | Senior secured notes | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.0336 0.0245
Consensus Pricing with Discounted Cash Flow | Default Rates | Minimum | Subordinated notes and preferred shares | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Liabilities, measurement input 0.02 0.01
Consensus Pricing with Discounted Cash Flow | Default Rates | Minimum | Senior secured notes | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.01 0.01
Consensus Pricing with Discounted Cash Flow | Default Rates | Minimum | Subordinated notes and preferred shares | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.01 0.01
Consensus Pricing with Discounted Cash Flow | Default Rates | Maximum | Subordinated notes and preferred shares | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Liabilities, measurement input 0.03 0.02
Consensus Pricing with Discounted Cash Flow | Default Rates | Maximum | Senior secured notes | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.03 0.02
Consensus Pricing with Discounted Cash Flow | Default Rates | Maximum | Subordinated notes and preferred shares | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.03 0.02
Consensus Pricing with Discounted Cash Flow | Default Rates | Weighted Average | Subordinated notes and preferred shares | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Liabilities, measurement input 0.02 0.01
Consensus Pricing with Discounted Cash Flow | Default Rates | Weighted Average | Senior secured notes | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.02 0.01
Consensus Pricing with Discounted Cash Flow | Default Rates | Weighted Average | Subordinated notes and preferred shares | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.02 0.01
Consensus Pricing with Discounted Cash Flow | Recovery Rates | Minimum | Subordinated notes and preferred shares | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Liabilities, measurement input 0.50 0.50
Consensus Pricing with Discounted Cash Flow | Recovery Rates | Minimum | Senior secured notes | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.50 0.50
Consensus Pricing with Discounted Cash Flow | Recovery Rates | Minimum | Subordinated notes and preferred shares | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.50 0.50
Consensus Pricing with Discounted Cash Flow | Recovery Rates | Maximum | Subordinated notes and preferred shares | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Liabilities, measurement input 0.70 0.70
Consensus Pricing with Discounted Cash Flow | Recovery Rates | Maximum | Senior secured notes | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.70 0.70
Consensus Pricing with Discounted Cash Flow | Recovery Rates | Maximum | Subordinated notes and preferred shares | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.70 0.70
Consensus Pricing with Discounted Cash Flow | Recovery Rates | Weighted Average | Subordinated notes and preferred shares | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Liabilities, measurement input 0.60 0.60
Consensus Pricing with Discounted Cash Flow | Recovery Rates | Weighted Average | Senior secured notes | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.60 0.60
Consensus Pricing with Discounted Cash Flow | Recovery Rates | Weighted Average | Subordinated notes and preferred shares | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.60 0.60
Consensus Pricing with Discounted Cash Flow | Discount Rates | Minimum | Subordinated notes and preferred shares | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Liabilities, measurement input 0.15 0.14
Consensus Pricing with Discounted Cash Flow | Discount Rates | Minimum | Subordinated notes and preferred shares | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.13 0.14
Consensus Pricing with Discounted Cash Flow | Discount Rates | Maximum | Subordinated notes and preferred shares | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Liabilities, measurement input 0.25 0.22
Consensus Pricing with Discounted Cash Flow | Discount Rates | Maximum | Subordinated notes and preferred shares | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.25 0.22
Consensus Pricing with Discounted Cash Flow | Discount Rates | Weighted Average | Subordinated notes and preferred shares | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Liabilities, measurement input 0.20 0.19
Consensus Pricing with Discounted Cash Flow | Discount Rates | Weighted Average | Subordinated notes and preferred shares | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.19 0.19
Other | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of assets $ 116.3  
Other | Discount Rates | Minimum | Loans | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.07  
Other | Discount Rates | Maximum | Loans | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.10  
Other | Discount Rates | Weighted Average | Loans | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.08