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Fair Value Measurement - Quantitative Information About Level III Inputs (Details) $ in Millions	Sep. 30, 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	$ 8,020.4
Fair value of liabilities	6,345.3	$ 6,298.6
Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value of assets	7,428.4	7,379.4
Fair value of liabilities	6,345.3	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	6,910.5	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	56.3
Consensus Pricing | Equity securities | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value of assets	4.1	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	503.1	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	$ 5,843.5	5,829.3
Consensus Pricing | BDC preferred shares | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value of assets		$ 81.7
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	0.29	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	130.17	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	1.03	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	1.03	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	0.00	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	0.92	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	$ 416.3	$ 366.5
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	10.2
Discounted Cash Flow | Loans | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value of assets	63.7	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	7.0	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	0.17
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	0.07
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	0.16	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	0.12	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	0.17
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	0.19	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	0.16	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	0.11	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	0.17
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	0.15
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	0.16	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 | 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	0.05	0.05
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	0.06
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	0.14
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	0.06
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	0.11
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 | 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	0.02
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	0.01
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 | Severity | Minimum | Equity securities | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Assets, measurement input	0.60
Discounted Cash Flow | Severity | Maximum | Equity securities | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Assets, measurement input	0.60
Discounted Cash Flow | Severity | Weighted Average | Equity securities | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Assets, measurement input	0.60
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	0.40
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 | 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	0.40
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	7.5	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	23.9	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	12.6	12.7
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	26.5	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	26.5	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	26.5	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	$ 163.5	$ 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	407.6	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	$ 56.9	$ 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	0.11	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	0.79	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	0.01	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	0.89	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	1.02	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	1.07	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	0.54	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	0.99	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	0.37	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	0.05	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	0.09	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	0.35	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	0.14	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	0.18	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	0.0108	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	0.1500	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	0.0234	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	0.01	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	0.01	0.01
Consensus Pricing with Discounted Cash Flow | Default Rates | Maximum | Subordinated notes and preferred shares | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Liabilities, measurement input	0.02	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
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		$ 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
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
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
Other | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value of liabilities	$ 10.2
Other | Senior secured notes | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value of liabilities	6,171.6
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	6.3	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
Fair value of liabilities		$ 18.5
Other | BDC preferred shares | Level III
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value of assets	$ 50.3
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	16.85
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	16.85
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	16.85

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