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Fair Value Measurements - Quantitative Information for Level 3 Inputs (Details) - Market Yield - Fair Value, Inputs, Level 3 [Member] $ in Millions	Jun. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
Senior Debt Obligations [Member] | Measurement Input, Discount Rate | Non-investment-grade | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.073	0.092
Senior Debt Obligations [Member] | Measurement Input, Discount Rate | Non-investment-grade | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.516	0.367
Senior Debt Obligations [Member] | Measurement Input, Discount Rate | Non-investment-grade | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.125	0.135
Junior Subordinated Debt [Member] | Measurement Input, Discount Rate | Non-investment-grade | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.100	0.118
Junior Subordinated Debt [Member] | Measurement Input, Discount Rate | Non-investment-grade | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.255	0.225
Junior Subordinated Debt [Member] | Measurement Input, Discount Rate | Non-investment-grade | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.143	0.138
Private Placement | External Credit Rating, Investment Grade [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	$ 57.3	$ 60.0
Private Placement | Measurement Input, Discount Rate | External Credit Rating, Investment Grade [Member] | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Alternative investment, measurement input	0.034	0.042
Private Placement | Measurement Input, Discount Rate | External Credit Rating, Investment Grade [Member] | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Alternative investment, measurement input	0.132	0.158
Private Placement | Measurement Input, Discount Rate | External Credit Rating, Investment Grade [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Alternative investment, measurement input	0.084	0.087
Senior Debt Obligations [Member] | Non-investment-grade
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	$ 78.1	$ 32.6
Junior Subordinated Debt [Member] | Non-investment-grade
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	36.6	32.5
Other Debt Obligations [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	71.3	64.4
Investments in Fixed Maturities
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	$ 243.3	$ 189.5

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