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Fair Value of Financial Instruments - Quantitative Information about Level 3 Fair Value Measurements (Details) $ in Millions	Sep. 30, 2024 USD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)	Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	$ 5,573.2		$ 5,235.3
Equity securities at fair value, (cost $102872373.8 and $86200000)	88.9		86.2
Net MRBs	(5.7)	$ (6.2)	(3.9)	$ (4.5)	$ (3.6)	$ 0.2
Fair Value | Recurring
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	5,573.2		5,235.3
Equity securities at fair value, (cost $102872373.8 and $86200000)	88.9		86.2
Financial Liabilities	86.1		86.0
Mortgage-backed securities
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	728.3		653.2
Mortgage-backed securities | Fair Value | Recurring
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	728.3		653.2
Municipal bonds
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	1,215.7		1,270.1
Municipal bonds | Fair Value | Recurring
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	1,215.7		1,270.1
Corporate bonds
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	1,944.5		1,772.7
Corporate bonds | Fair Value | Recurring
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	1,944.5		1,772.7
Other asset-backed securities
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	1,282.5		1,128.4
Other asset-backed securities | Fair Value | Recurring
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	1,282.5		1,128.4
Level 3 | Fair Value | Recurring
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	544.1		514.0
Equity securities at fair value, (cost $102872373.8 and $86200000)	4.0		4.5
Totals	548.1		518.5
Financial Liabilities	81.1		82.4
Derivatives embedded in fixed indexed annuity products	86.8
Net MRBs	(5.7)
Level 3 | Fair Value | Recurring | Internal
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	224.8		180.4
Equity securities at fair value, (cost $102872373.8 and $86200000)	0.0		0.0
Totals	224.8		180.4
Financial Liabilities	81.1		82.4
Level 3 | Fair Value | Recurring | External
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	319.3		333.6
Equity securities at fair value, (cost $102872373.8 and $86200000)	4.0		4.5
Totals	323.3		338.1
Financial Liabilities	0.0		0.0
Level 3 | Mortgage-backed securities | Fair Value | Recurring
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	0.0		0.0
Level 3 | Mortgage-backed securities | Fair Value | Recurring | Internal
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	0.0		0.0
Level 3 | Mortgage-backed securities | Fair Value | Recurring | External
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	0.0		0.0
Level 3 | Municipal bonds | Fair Value | Recurring
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	76.6		74.0
Level 3 | Municipal bonds | Fair Value | Recurring | Internal
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	0.0		0.0
Level 3 | Municipal bonds | Fair Value | Recurring | External
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	76.6		74.0
Level 3 | Corporate bonds | Fair Value | Recurring
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	382.8		342.5
Level 3 | Corporate bonds | Fair Value | Recurring | Internal
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	224.8		180.4
Level 3 | Corporate bonds | Fair Value | Recurring | External
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	158.0		162.1
Level 3 | Other asset-backed securities | Fair Value | Recurring
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	84.7		97.5
Level 3 | Other asset-backed securities | Fair Value | Recurring | Internal
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	0.0		0.0
Level 3 | Other asset-backed securities | Fair Value | Recurring | External
Fair Value Measurement Inputs and Valuation Techniques
Fair Value	$ 84.7		$ 97.5
Minimum | Level 3 | discounted cash flow | option budget
Fair Value Measurement Inputs and Valuation Techniques
Derivatives embedded in fixed indexed annuity products, measurement input	0.009
Minimum | Level 3 | Corporate bonds | discounted cash flow | yield
Fair Value Measurement Inputs and Valuation Techniques
Debt securities, measurement input	0.037
Minimum | Level 3 | Corporate bonds | discounted cash flow | option adjusted spread
Fair Value Measurement Inputs and Valuation Techniques
Debt securities, measurement input	0.0306
Maximum | Level 3 | discounted cash flow | option budget
Fair Value Measurement Inputs and Valuation Techniques
Derivatives embedded in fixed indexed annuity products, measurement input	0.038
Maximum | Level 3 | Corporate bonds | discounted cash flow | yield
Fair Value Measurement Inputs and Valuation Techniques
Debt securities, measurement input	0.162
Maximum | Level 3 | Corporate bonds | discounted cash flow | option adjusted spread
Fair Value Measurement Inputs and Valuation Techniques
Debt securities, measurement input	0.0832
Weighted Average | Level 3 | discounted cash flow | lapse rate
Fair Value Measurement Inputs and Valuation Techniques
Derivatives embedded in fixed indexed annuity products, measurement input	0.059
Net MRBs, measurement input	0.059
Weighted Average | Level 3 | discounted cash flow | mortality multiplier
Fair Value Measurement Inputs and Valuation Techniques
Derivatives embedded in fixed indexed annuity products, measurement input	0.694
Net MRBs, measurement input	0.694
Weighted Average | Level 3 | discounted cash flow | non-performance adjustment
Fair Value Measurement Inputs and Valuation Techniques
Derivatives embedded in fixed indexed annuity products, measurement input	0.050

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