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Fair Value Measurement -Schedule of Quantitative Information About Level III Inputs (Details)
$ in Millions
Jun. 30, 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 $ 10,402.3  
Fair value of liabilities 7,936.2 $ 6,809.7
Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of assets 9,877.7 7,932.5
Fair value of liabilities 7,923.0 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 9,444.5 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 94.3  
Consensus Pricing | Equity securities | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of assets 2.0 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 569.7 465.1
Consensus Pricing | Loans | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of assets $ 7,817.5 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 0.25 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 22.93 112.17
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 1.06 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 1.02 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 0.14 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 0.97 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 $ 717.8 $ 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 96.0 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 141.6 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 4.1 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 $ 9.1 $ 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 0.08 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 0.14 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 0.40 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 0.14 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 0.19 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 0.14 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 0.09 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 0.14  
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 0.08  
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 0.01  
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 0.03  
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 0.25  
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 4.9 7.7
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 21.7 23.2
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 12.8
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 28.1 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 28.1 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 28.1 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 $ 265.9 $ 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 313.7 321.8
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 53.2 $ 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 $ 39.8  
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 0.12 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 0.84 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 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 0.96  
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 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 1  
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 0.59 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 0.99 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 0.67 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 (0.02) 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 0.08 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 0.07  
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 0.36 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 0.31 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 0.12  
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 0.12 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 0.10  
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 0.0080 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 0.1349 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 0.0214 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 $ 41.1  
Other | Senior secured notes | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of liabilities 7,657.1  
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 1.5 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 | Loans | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of assets $ 17.4  
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