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Fair Value Measurement - Quantitative Information About Level III Inputs (Details) $ in Millions	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($) $ / shares
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value of assets	$ 8,167.5
Fair value of liabilities	6,353.0	$ 6,298.6
Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value of assets	7,566.6	7,379.4
Fair value of liabilities	6,352.3	6,298.6
Senior secured notes | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value of liabilities		6,090.1
Investments of Consolidated Funds | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value of assets	6,952.6	6,762.2
Equity securities | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value of assets	7.8
BDC preferred shares | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value of assets	90.1	81.7
Consensus Pricing | Equity securities | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value of assets	3.0	3.3
Consensus Pricing | Bonds | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value of assets	500.4	522.5
Consensus Pricing | Loans | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value of assets	$ 6,040.8	$ 5,829.3
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	0.30	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 | Maximum | Equity securities | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Assets, measurement input	203.50	208.38
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	1.08	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	1.02
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	0.11
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	0.93	0.90
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	0.95
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	$ 317.1	$ 322.1
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	44.4	44.4
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	15.0
Discounted Cash Flow | Loans | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value of assets	10.7	11.0
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	8.9	9.4
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	$ 3.1	$ 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	0.10	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	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	0.11
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	0.11	0.07
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	0.17	0.17
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	0.11
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	0.11
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	0.21	0.16
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	0.17	0.17
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	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	0.11
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	0.20	0.15
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	0.17	0.17
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	0.07
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	0.05
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	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	0.05
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	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	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
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 | 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 | Maximum | 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 | Weighted Average | 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 | 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
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 | 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 | 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 | 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 | 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 | Loans | 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	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	7.3
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	7.3
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	7.3
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	25	24.3
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	25	24.3
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	25	24.3
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	25	24.3
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	25	24.3
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	25	24.3
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	$ 188.0	$ 190.0
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	458.7	472.2
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	$ 61.0	$ 59.4
Consensus Pricing with Discounted Cash Flow | Indicative Quotes | Minimum | Subordinated notes and preferred shares | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Liabilities, measurement input	0.19	0.16
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	0.75	0.72
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	0.06	0.06
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	0.94	1.03
Consensus Pricing with Discounted Cash Flow | Indicative Quotes | Maximum | Senior secured notes | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Assets, measurement input	1	1.01
Consensus Pricing with Discounted Cash Flow | Indicative Quotes | Maximum | Subordinated notes and preferred shares | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Assets, measurement input	0.93	0.90
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	0.56	0.41
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	0.98	0.96
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	0.40
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	0.14	0.14
Consensus Pricing with Discounted Cash Flow | Discount Rates | Minimum | Subordinated notes and preferred shares | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Assets, measurement input	0.11	0.11
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	0.30	0.30
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	0.35	0.40
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	0.19	0.21
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	0.21	0.21
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	0.0110	0.0139
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	0.1613	0.1600
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	0.0267	0.0319
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	0.01
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
Liquidation Analysis | 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	$ 0.1
Liquidation Analysis | % of Net Book Value | 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
Liquidation Analysis | % of Net Book Value | 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	0.10
Liquidation Analysis | % of Net Book Value | 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	0.03
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	$ 90.1	$ 81.7
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 | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value of liabilities	$ 11.3
Other | Senior secured notes | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value of liabilities	6,153.0
Other | Equity securities | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value of assets		$ 7.8
Other | Loans | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value of assets	4.5	12.4
Other | 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	$ 1.0	1.0
Fair value of liabilities		$ 18.5

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