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Fair Value Measurement - Quantitative Information About Level III Inputs (Details)
$ in Millions
Mar. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
$ / shares
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of assets $ 9,873.2  
Fair value of liabilities 7,683.3 $ 6,809.7
Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of assets 9,379.3 7,932.5
Fair value of liabilities 7,680.3 6,809.1
Senior secured notes | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of liabilities   6,598.8
Investments of Consolidated Funds | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of assets 8,950.1 7,468.5
Equity securities | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of assets 103.0  
Consensus Pricing | Equity securities | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of assets 4.6 3.9
Consensus Pricing | Bonds | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of assets 495.8 465.1
Consensus Pricing | Loans | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of assets $ 7,527.4 6,408.2
Consensus Pricing | Loans | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of assets   $ 28.8
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 0.31 0.30
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
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   0.99
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 79.83 112.17
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 1.07 1.03
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 1.05
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   0.99
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 0.27 0.01
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 0.95 0.93
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 0.98 0.97
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   0.99
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 $ 642.4 $ 485.0
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 71.7 38.2
Discounted Cash Flow | Loans | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of assets 97.4 10.2
Discounted Cash Flow | Loan two | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of assets 6.5 6.4
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 $ 8.5 $ 2.9
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 0.10
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 0.07 0.14
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 0.07 0.09
Discounted Cash Flow | Discount Rates | Minimum | Loan two | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.15 0.16
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 0.21 0.21
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 0.17 0.13
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 0.34 0.34
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 0.17 0.19
Discounted Cash Flow | Discount Rates | Maximum | Loan two | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.15 0.16
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 0.21 0.21
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 0.11 0.11
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 0.21 0.18
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 0.18
Discounted Cash Flow | Discount Rates | Weighted Average | Loan two | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.15 0.16
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 0.21 0.21
Discounted Cash Flow | Terminal Growth Rate | Minimum | Equity securities | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0 0.03
Discounted Cash Flow | Terminal Growth Rate | Maximum | Equity securities | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.07 0.07
Discounted Cash Flow | Terminal Growth Rate | Weighted Average | Equity securities | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.04 0.06
Discounted Cash Flow | Constant Prepayment Rate | Minimum | Equity securities | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input   0.06
Discounted Cash Flow | Constant Prepayment Rate | Minimum | Equity securities | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.06  
Discounted Cash Flow | Constant Prepayment Rate | Minimum | Loans | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input   0.08
Discounted Cash Flow | Constant Prepayment Rate | Minimum | Loan two | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.08  
Discounted Cash Flow | Constant Prepayment Rate | Maximum | Equity securities | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input   0.16
Discounted Cash Flow | Constant Prepayment Rate | Maximum | Equity securities | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.18  
Discounted Cash Flow | Constant Prepayment Rate | Maximum | Loans | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input   0.14
Discounted Cash Flow | Constant Prepayment Rate | Maximum | Loan two | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.14  
Discounted Cash Flow | Constant Prepayment Rate | Weighted Average | Equity securities | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input   0.11
Discounted Cash Flow | Constant Prepayment Rate | 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 | Constant Prepayment Rate | Weighted Average | Loans | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input   0.11
Discounted Cash Flow | Constant Prepayment Rate | Weighted Average | Loan two | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.11  
Discounted Cash Flow | Default Rates | Minimum | Equity securities | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input   0.01
Discounted Cash Flow | Default Rates | Minimum | Equity securities | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0  
Discounted Cash Flow | Default Rates | Minimum | Loans | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input   0.01
Discounted Cash Flow | Default Rates | Minimum | Loan two | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.01  
Discounted Cash Flow | Default Rates | Maximum | Equity securities | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input   0.04
Discounted Cash Flow | Default Rates | Maximum | Equity securities | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.06  
Discounted Cash Flow | Default Rates | Maximum | Loans | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input   0.01
Discounted Cash Flow | Default Rates | Maximum | Loan two | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.01  
Discounted Cash Flow | Default Rates | Weighted Average | Equity securities | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input   0.02
Discounted Cash Flow | Default Rates | Weighted Average | Equity securities | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.02  
Discounted Cash Flow | Default Rates | Weighted Average | Loans | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input   0.01
Discounted Cash Flow | Default Rates | Weighted Average | Loan two | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.01  
Discounted Cash Flow | Recovery Rates | Minimum | Equity securities | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input   0
Discounted Cash Flow | Recovery Rates | Minimum | Equity securities | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0  
Discounted Cash Flow | Recovery Rates | Minimum | Loans | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input   0
Discounted Cash Flow | Recovery Rates | Minimum | Loan two | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0  
Discounted Cash Flow | Recovery Rates | Maximum | Equity securities | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input   0.40
Discounted Cash Flow | Recovery Rates | Maximum | Equity securities | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.40  
Discounted Cash Flow | Recovery Rates | Maximum | Loans | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input   0
Discounted Cash Flow | Recovery Rates | Maximum | Loan two | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0  
Discounted Cash Flow | Recovery Rates | Weighted Average | Equity securities | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input   0.17
Discounted Cash Flow | Recovery Rates | Weighted Average | Equity securities | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.24  
Discounted Cash Flow | Recovery Rates | Weighted Average | Loans | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input   0
Discounted Cash Flow | Recovery Rates | Weighted Average | Loan two | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0  
Comparable Multiple | EBITDA Multiple | Minimum | Equity securities | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 6.8 7.7
Comparable Multiple | EBITDA Multiple | Minimum | Loans | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 6  
Comparable Multiple | EBITDA Multiple | Maximum | Equity securities | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 21.8 23.2
Comparable Multiple | EBITDA Multiple | Maximum | Loans | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 6  
Comparable Multiple | EBITDA Multiple | Weighted Average | Equity securities | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 12.3 12.8
Comparable Multiple | EBITDA Multiple | Weighted Average | Loans | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 6  
Comparable Multiple | TCF Multiple | Minimum | Equity securities | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 28.9 26
Comparable Multiple | TCF Multiple | Maximum | Equity securities | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 28.9 26
Comparable Multiple | TCF Multiple | Weighted Average | Equity securities | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 28.9 26
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 $ 246.1 $ 210.3
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 305.7 321.8
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 59.8 $ 57.1
Consensus Pricing with Discounted Cash Flow | Loans | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of assets $ 55.2  
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 0.15 0.11
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 0.87 0.80
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 0.01 0.01
Consensus Pricing with Discounted Cash Flow | Indicative Quotes | Minimum | Loans | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.97  
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 0.89 0.87
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 1.01 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 1 1.03
Consensus Pricing with Discounted Cash Flow | Indicative Quotes | Maximum | Loans | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 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]    
Liabilities, measurement input 0.53 0.34
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 1 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 0.42 0.38
Consensus Pricing with Discounted Cash Flow | Indicative Quotes | Weighted Average | Loans | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.98  
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 (0.03) 0.02
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 0.05 0.04
Consensus Pricing with 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  
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 0.35 0.35
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 0.36 0.35
Consensus Pricing with 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 0.16  
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 0.13 0.15
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 0.15 0.16
Consensus Pricing with 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 0.11  
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 0.0086 0.0113
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 0.1355 0.1535
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 0.0193 0.0214
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 0.01 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 0.02 0.02
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 0.02 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 0.02 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 0.02 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 0.02 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 0.02
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 0.02
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]    
Assets, measurement input 0.02 0.02
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 0.60 0.60
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 0.60 0.60
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 0.60 0.60
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 0.60 0.60
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 0.60 0.60
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 0.60 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]    
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
Other | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of assets $ 48.6  
Other | Senior secured notes | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of liabilities 7,434.2  
Other | Equity securities | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of assets   $ 44.9
Other | Loans | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of assets $ 1.3 6.6
Other | BDC preferred shares | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of assets   $ 53.4
Other | Net Asset Value per Share | Minimum | BDC preferred shares | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input   16.80
Other | Net Asset Value per Share | Maximum | BDC preferred shares | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input   16.80
Other | Net Asset Value per Share | Weighted Average | BDC preferred shares | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input   16.80