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Fair Value Measurement - Summary of Quantitative Information about Level III Inputs (Details)
$ in Millions
Mar. 31, 2023
USD ($)
$ / shares
Dec. 31, 2022
USD ($)
$ / shares
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of assets $ 7,848.4 $ 7,049.3
Fair value of liabilities 5,649.5 5,494.8
Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of assets 7,131.3 6,983.9
Fair value of liabilities 5,647.9 5,491.6
Senior secured notes | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of liabilities   5,303.3
Investments of Consolidated Funds | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of assets 6,510.4 6,378.4
Equity securities | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of assets 17.3  
BDC preferred shares | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of assets 73.6 76.9
Consensus Pricing | Equity securities | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of assets 2.5 3.1
Consensus Pricing | Bonds | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of assets 593.2 594.9
Consensus Pricing | Loans | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of assets 5,121.2 5,043.4
Consensus Pricing | Loan two | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of assets 10.5 37.4
Consensus Pricing | Loan three | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of assets $ 8.4 $ 11.1
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 40 0.46
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 | Loan two | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input | $ / shares 0.86  
Consensus Pricing | Indicative Quotes | Minimum | Loan three | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input | $ / shares 0.98 0.91
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 392.50 4.73
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 1.05
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 1.02 1
Consensus Pricing | Indicative Quotes | Maximum | Loan two | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input | $ / shares 0.86  
Consensus Pricing | Indicative Quotes | Maximum | Loan three | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input | $ / shares 0.98 0.91
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 0.08 0.18
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 0.88
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 0.94 0.91
Consensus Pricing | Indicative Quotes | Weighted Average | Loan two | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input | $ / shares 0.86  
Consensus Pricing | Indicative Quotes | Weighted Average | Loan three | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input | $ / shares 0.98 0.91
Consensus Pricing | Market Yields | Minimum | Loan two | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input | $ / shares   0.97
Consensus Pricing | Market Yields | Maximum | Loan two | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input | $ / shares   0.98
Consensus Pricing | Market Yields | Weighted Average | Loan two | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input | $ / shares   0.97
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 $ 365.4 $ 363.5
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 50.0  
Discounted Cash Flow | Loans | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of assets 11.4 11.8
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 329.7 248.7
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 $ 2.5 $ 2.5
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 0.10 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 0.10  
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 0.08 0
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 0.07 0.07
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 0.10 0.10
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 0.13 0.09
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 0.10 0.10
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 0.10 0.10
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 0.10  
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 0.13 0.01
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 0.08 0.08
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
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  
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 | Maximum | Equity securities | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 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 0.05 0.05
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 0.05  
Comparable Multiple | Equity securities | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of assets $ 0.3  
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 12.7 12.7
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 13.8  
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 12.7 12.7
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 19  
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 12.7 12.7
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 17.8  
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 24.5 23.8
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 24.5  
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 24.5 23.8
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 24.5 23.8
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 liabilities $ 196.8 $ 188.3
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 476.6 462.1
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 $ 68.2 $ 64.0
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 0.21 0.21
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 0.72 0.67
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
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 0.99 0.96
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
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 0.86 0.82
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 0.39 0.38
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 0.93
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 0.55 0.40
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 0.15
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 0.15 0.15
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 0.25
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 0.25
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 0.20
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 0.20 0.20
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 0.0170 0.0170
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 0.1365 0.1800
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 0.0314 0.0386
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 0.02
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 0.02
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]    
Liabilities, measurement input 0.03 0.03
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 0.03
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 0.03
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 0.03 0.03
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 0.50
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 0.60 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 0.60 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 0.60 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 0.60 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 0.60 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
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 $ 73.6 $ 76.9
Market Yield Analysis | Market Yields | Minimum | BDC preferred shares | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.11 0.11
Market Yield Analysis | Market Yields | Maximum | BDC preferred shares | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.11 0.11
Market Yield Analysis | Market Yields | Weighted Average | BDC preferred shares | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Assets, measurement input 0.11 0.11
Other | Senior secured notes | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of liabilities $ 5,451.1  
Other | Equity securities | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of assets   $ 64.0
Other | Loans | Level III    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value of assets $ 0.5 $ 0.5