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FAIR VALUE MEASUREMENTS - MEASUREMENTS BY INPUT LEVEL (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Assets:
Total fixed maturities, available for sale	$ 23,724.7	$ 21,506.2
Equity securities - corporate securities	120.5	96.9
Total trading securities	217.4	222.7
Investments held by variable interest entities - corporate securities	250.1	768.6
Total other invested assets	1,595.5	1,353.4
Market risk benefit asset	96.4	75.4	$ 89.3
Assets held in separate accounts	3.3	3.1
Liabilities:
Market risk benefit liability	1.0	7.4	$ 3.1
Corporate securities
Assets:
Total fixed maturities, available for sale	12,728.7	11,837.5
Certificates of deposit
Assets:
Total fixed maturities, available for sale	483.1
United States Treasury securities and obligations of United States government corporations and agencies
Assets:
Total fixed maturities, available for sale	199.3	194.4
States and political subdivisions
Assets:
Total fixed maturities, available for sale	2,967.7	2,566.7
Foreign governments
Assets:
Total fixed maturities, available for sale	94.7	83.1
Asset-backed securities
Assets:
Total fixed maturities, available for sale	1,535.0	1,372.4
Agency residential mortgage-backed securities
Assets:
Total fixed maturities, available for sale	826.9	648.0
Non-agency residential mortgage-backed securities
Assets:
Total fixed maturities, available for sale	1,608.7	1,553.2
Collateralized loan obligations
Assets:
Total fixed maturities, available for sale	1,082.2	1,032.8
Commercial mortgage-backed securities
Assets:
Total fixed maturities, available for sale	2,198.4	2,218.1
Significant unobservable inputs  (Level 3)
Assets:
Total assets carried at fair value by category	401.9	377.5
Fair Value, Measurements, Recurring
Assets:
Total trading securities	217.4	222.7
Investments held by variable interest entities - corporate securities	250.1	768.6
Derivatives	373.6	239.2
Residual tranches	76.9	39.0
Total other invested assets	450.5	278.2
Market risk benefit asset	96.4	75.4
Assets held in separate accounts	3.3	3.1
Total assets carried at fair value by category	24,862.9	22,951.1
Liabilities:
Market risk benefit liability	1.0	7.4
Embedded derivatives associated with fixed indexed annuity products	1,551.9	1,376.7
Total liabilities carried at fair value by category	1,552.9	1,384.1
Fair Value, Measurements, Recurring | Corporate securities
Assets:
Total fixed maturities, available for sale	12,728.7	11,837.5
Equity securities - corporate securities	120.5	96.9
Fair Value, Measurements, Recurring | Certificates of deposit
Assets:
Total fixed maturities, available for sale	483.1
Fair Value, Measurements, Recurring | United States Treasury securities and obligations of United States government corporations and agencies
Assets:
Total fixed maturities, available for sale	199.3	194.4
Fair Value, Measurements, Recurring | States and political subdivisions
Assets:
Total fixed maturities, available for sale	2,967.7	2,566.7
Fair Value, Measurements, Recurring | Foreign governments
Assets:
Total fixed maturities, available for sale	94.7	83.1
Fair Value, Measurements, Recurring | Asset-backed securities
Assets:
Total fixed maturities, available for sale	1,535.0	1,372.4
Total trading securities	41.9	32.8
Fair Value, Measurements, Recurring | Agency residential mortgage-backed securities
Assets:
Total fixed maturities, available for sale	826.9	648.0
Total trading securities	4.4	3.5
Fair Value, Measurements, Recurring | Non-agency residential mortgage-backed securities
Assets:
Total fixed maturities, available for sale	1,608.7	1,553.2
Total trading securities	56.5	58.5
Fair Value, Measurements, Recurring | Collateralized loan obligations
Assets:
Total fixed maturities, available for sale	1,082.2	1,032.8
Total trading securities	9.4	9.0
Fair Value, Measurements, Recurring | Commercial mortgage-backed securities
Assets:
Total fixed maturities, available for sale	2,198.4	2,218.1
Total trading securities	105.2	118.9
Fair Value, Measurements, Recurring | Total Fixed Maturities, Available For Sale
Assets:
Total fixed maturities, available for sale	23,724.7	21,506.2
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets or liabilities (Level 1)
Assets:
Total trading securities	0.0	0.0
Investments held by variable interest entities - corporate securities	0.0	0.0
Derivatives	0.0	0.0
Residual tranches	0.0	0.0
Total other invested assets	0.0	0.0
Market risk benefit asset	0.0	0.0
Assets held in separate accounts	0.0	0.0
Total assets carried at fair value by category	47.1	24.2
Liabilities:
Market risk benefit liability	0.0	0.0
Embedded derivatives associated with fixed indexed annuity products	0.0	0.0
Total liabilities carried at fair value by category	0.0	0.0
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets or liabilities (Level 1) | Corporate securities
Assets:
Total fixed maturities, available for sale	0.0	0.0
Equity securities - corporate securities	47.1	24.2
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets or liabilities (Level 1) | Certificates of deposit
Assets:
Total fixed maturities, available for sale	0.0
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets or liabilities (Level 1) | United States Treasury securities and obligations of United States government corporations and agencies
Assets:
Total fixed maturities, available for sale	0.0	0.0
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets or liabilities (Level 1) | States and political subdivisions
Assets:
Total fixed maturities, available for sale	0.0	0.0
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets or liabilities (Level 1) | Foreign governments
Assets:
Total fixed maturities, available for sale	0.0	0.0
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets or liabilities (Level 1) | Asset-backed securities
Assets:
Total fixed maturities, available for sale	0.0	0.0
Total trading securities	0.0	0.0
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets or liabilities (Level 1) | Agency residential mortgage-backed securities
Assets:
Total fixed maturities, available for sale	0.0	0.0
Total trading securities	0.0	0.0
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets or liabilities (Level 1) | Non-agency residential mortgage-backed securities
Assets:
Total fixed maturities, available for sale	0.0	0.0
Total trading securities	0.0	0.0
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets or liabilities (Level 1) | Collateralized loan obligations
Assets:
Total fixed maturities, available for sale	0.0	0.0
Total trading securities	0.0	0.0
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets or liabilities (Level 1) | Commercial mortgage-backed securities
Assets:
Total fixed maturities, available for sale	0.0	0.0
Total trading securities	0.0	0.0
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets or liabilities (Level 1) | Total Fixed Maturities, Available For Sale
Assets:
Total fixed maturities, available for sale	0.0	0.0
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)
Assets:
Total trading securities	217.4	222.7
Investments held by variable interest entities - corporate securities	250.1	768.6
Derivatives	373.6	239.2
Residual tranches	0.9	7.5
Total other invested assets	374.5	246.7
Market risk benefit asset	0.0	0.0
Assets held in separate accounts	3.3	3.1
Total assets carried at fair value by category	24,413.9	22,549.4
Liabilities:
Market risk benefit liability	0.0	0.0
Embedded derivatives associated with fixed indexed annuity products	0.0	0.0
Total liabilities carried at fair value by category	0.0	0.0
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Corporate securities
Assets:
Total fixed maturities, available for sale	12,599.0	11,678.2
Equity securities - corporate securities	0.0	0.0
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Certificates of deposit
Assets:
Total fixed maturities, available for sale	483.1
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | United States Treasury securities and obligations of United States government corporations and agencies
Assets:
Total fixed maturities, available for sale	199.3	194.4
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | States and political subdivisions
Assets:
Total fixed maturities, available for sale	2,967.7	2,566.7
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Foreign governments
Assets:
Total fixed maturities, available for sale	94.7	83.1
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Asset-backed securities
Assets:
Total fixed maturities, available for sale	1,508.6	1,346.9
Total trading securities	41.9	32.8
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Agency residential mortgage-backed securities
Assets:
Total fixed maturities, available for sale	826.9	648.0
Total trading securities	4.4	3.5
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Non-agency residential mortgage-backed securities
Assets:
Total fixed maturities, available for sale	1,608.7	1,553.2
Total trading securities	56.5	58.5
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Collateralized loan obligations
Assets:
Total fixed maturities, available for sale	1,082.2	1,032.8
Total trading securities	9.4	9.0
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Commercial mortgage-backed securities
Assets:
Total fixed maturities, available for sale	2,198.4	2,205.0
Total trading securities	105.2	118.9
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Total Fixed Maturities, Available For Sale
Assets:
Total fixed maturities, available for sale	23,568.6	21,308.3
Fair Value, Measurements, Recurring | Significant unobservable inputs  (Level 3)
Assets:
Total trading securities	0.0	0.0
Investments held by variable interest entities - corporate securities	0.0	0.0
Derivatives	0.0	0.0
Residual tranches	76.0	31.5
Total other invested assets	76.0	31.5
Market risk benefit asset	96.4	75.4
Assets held in separate accounts	0.0	0.0
Total assets carried at fair value by category	401.9	377.5
Liabilities:
Market risk benefit liability	1.0	7.4
Embedded derivatives associated with fixed indexed annuity products	1,551.9	1,376.7
Total liabilities carried at fair value by category	1,552.9	1,384.1
Fair Value, Measurements, Recurring | Significant unobservable inputs  (Level 3) | Corporate securities
Assets:
Total fixed maturities, available for sale	129.7	159.3
Equity securities - corporate securities	73.4	72.7
Fair Value, Measurements, Recurring | Significant unobservable inputs  (Level 3) | Certificates of deposit
Assets:
Total fixed maturities, available for sale	0.0
Fair Value, Measurements, Recurring | Significant unobservable inputs  (Level 3) | United States Treasury securities and obligations of United States government corporations and agencies
Assets:
Total fixed maturities, available for sale	0.0	0.0
Fair Value, Measurements, Recurring | Significant unobservable inputs  (Level 3) | States and political subdivisions
Assets:
Total fixed maturities, available for sale	0.0	0.0
Fair Value, Measurements, Recurring | Significant unobservable inputs  (Level 3) | Foreign governments
Assets:
Total fixed maturities, available for sale	0.0	0.0
Fair Value, Measurements, Recurring | Significant unobservable inputs  (Level 3) | Asset-backed securities
Assets:
Total fixed maturities, available for sale	26.4	25.5
Total trading securities	0.0	0.0
Fair Value, Measurements, Recurring | Significant unobservable inputs  (Level 3) | Agency residential mortgage-backed securities
Assets:
Total fixed maturities, available for sale	0.0	0.0
Total trading securities	0.0	0.0
Fair Value, Measurements, Recurring | Significant unobservable inputs  (Level 3) | Non-agency residential mortgage-backed securities
Assets:
Total fixed maturities, available for sale	0.0	0.0
Total trading securities	0.0	0.0
Fair Value, Measurements, Recurring | Significant unobservable inputs  (Level 3) | Collateralized loan obligations
Assets:
Total fixed maturities, available for sale	0.0	0.0
Total trading securities	0.0	0.0
Fair Value, Measurements, Recurring | Significant unobservable inputs  (Level 3) | Commercial mortgage-backed securities
Assets:
Total fixed maturities, available for sale	0.0	13.1
Total trading securities	0.0	0.0
Fair Value, Measurements, Recurring | Significant unobservable inputs  (Level 3) | Total Fixed Maturities, Available For Sale
Assets:
Total fixed maturities, available for sale	$ 156.1	$ 197.9

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