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FAIR VALUE MEASUREMENTS - FAIR VALUE MEASUREMENTS OF FINANCIAL INSTRUMENTS MEASURED ON A RECURRING BASIS - SECURITIES (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Assets:
Estimated fair value	$ 22,840.5	$ 21,506.2
Equity securities - corporate securities	162.0	96.9
Trading securities	304.2	222.7
Investments held by variable interest entities	432.3	768.6
Total other invested assets	1,491.5	1,353.4
Assets held in separate accounts	3.3	3.1
Liabilities:
Market risk benefit liability	60.0	117.1
Significant unobservable inputs  (Level 3)
Assets:
Total assets carried at fair value by category	324.7	302.1
Fair value, Measurements, Recurring
Assets:
Trading securities	304.2	222.7
Investments held by variable interest entities	432.3	768.6
Derivatives	279.0	239.2
Residual tranches	96.9	39.0
Total other invested assets	375.9	278.2
Assets held in separate accounts	3.3	3.1
Total assets carried at fair value by category	24,118.2	22,875.7
Liabilities:
Market risk benefit liability	60.0	117.1
Embedded derivatives associated with fixed indexed annuity products	1,493.2	1,376.7
Total liabilities carried at fair value by category	1,553.2	1,493.8
Fair value, Measurements, Recurring | Corporate securities
Assets:
Estimated fair value	12,151.1	11,837.5
Equity securities - corporate securities	162.0	96.9
Fair value, Measurements, Recurring | Certificates of deposit
Assets:
Estimated fair value	488.3	0.0
Fair value, Measurements, Recurring | United States Treasury securities and obligations of United States government corporations and agencies
Assets:
Estimated fair value	186.2	194.4
Fair value, Measurements, Recurring | States and political subdivisions
Assets:
Estimated fair value	2,834.3	2,566.7
Fair value, Measurements, Recurring | Foreign governments
Assets:
Estimated fair value	91.2	83.1
Fair value, Measurements, Recurring | Asset-backed securities
Assets:
Estimated fair value	1,516.4	1,372.4
Trading securities	40.6	32.8
Fair value, Measurements, Recurring | Agency residential mortgage-backed securities
Assets:
Estimated fair value	819.6	648.0
Trading securities	97.1	3.5
Fair value, Measurements, Recurring | Non-agency residential mortgage-backed securities
Assets:
Estimated fair value	1,539.1	1,553.2
Trading securities	53.3	58.5
Fair value, Measurements, Recurring | Collateralized loan obligations
Assets:
Estimated fair value	1,016.8	1,032.8
Trading securities	9.5	9.0
Fair value, Measurements, Recurring | Commercial mortgage-backed securities
Assets:
Estimated fair value	2,197.5	2,218.1
Trading securities	103.7	118.9
Fair value, Measurements, Recurring | Total fixed maturities, available for sale
Assets:
Estimated fair value	22,840.5	21,506.2
Fair value, Measurements, Recurring | Quoted prices in active markets for identical assets or liabilities (Level 1)
Assets:
Trading securities	0.0	0.0
Investments held by variable interest entities	0.0	0.0
Derivatives	0.0	0.0
Residual tranches	0.0	0.0
Total other invested assets	0.0	0.0
Assets held in separate accounts	0.0	0.0
Total assets carried at fair value by category	64.0	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:
Estimated fair value	0.0	0.0
Equity securities - corporate securities	64.0	24.2
Fair value, Measurements, Recurring | Quoted prices in active markets for identical assets or liabilities (Level 1) | Certificates of deposit
Assets:
Estimated fair value	0.0	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:
Estimated fair value	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:
Estimated fair value	0.0	0.0
Fair value, Measurements, Recurring | Quoted prices in active markets for identical assets or liabilities (Level 1) | Foreign governments
Assets:
Estimated fair value	0.0	0.0
Fair value, Measurements, Recurring | Quoted prices in active markets for identical assets or liabilities (Level 1) | Asset-backed securities
Assets:
Estimated fair value	0.0	0.0
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:
Estimated fair value	0.0	0.0
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:
Estimated fair value	0.0	0.0
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:
Estimated fair value	0.0	0.0
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:
Estimated fair value	0.0	0.0
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:
Estimated fair value	0.0	0.0
Fair value, Measurements, Recurring | Significant other observable inputs (Level 2)
Assets:
Trading securities	304.2	222.7
Investments held by variable interest entities	432.3	768.6
Derivatives	279.0	239.2
Residual tranches	1.5	7.5
Total other invested assets	280.5	246.7
Assets held in separate accounts	3.3	3.1
Total assets carried at fair value by category	23,729.5	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:
Estimated fair value	12,023.1	11,678.2
Equity securities - corporate securities	24.6	0.0
Fair value, Measurements, Recurring | Significant other observable inputs (Level 2) | Certificates of deposit
Assets:
Estimated fair value	488.3	0.0
Fair value, Measurements, Recurring | Significant other observable inputs (Level 2) | United States Treasury securities and obligations of United States government corporations and agencies
Assets:
Estimated fair value	186.2	194.4
Fair value, Measurements, Recurring | Significant other observable inputs (Level 2) | States and political subdivisions
Assets:
Estimated fair value	2,834.3	2,566.7
Fair value, Measurements, Recurring | Significant other observable inputs (Level 2) | Foreign governments
Assets:
Estimated fair value	91.2	83.1
Fair value, Measurements, Recurring | Significant other observable inputs (Level 2) | Asset-backed securities
Assets:
Estimated fair value	1,496.6	1,346.9
Trading securities	40.6	32.8
Fair value, Measurements, Recurring | Significant other observable inputs (Level 2) | Agency residential mortgage-backed securities
Assets:
Estimated fair value	819.6	648.0
Trading securities	97.1	3.5
Fair value, Measurements, Recurring | Significant other observable inputs (Level 2) | Non-agency residential mortgage-backed securities
Assets:
Estimated fair value	1,539.1	1,553.2
Trading securities	53.3	58.5
Fair value, Measurements, Recurring | Significant other observable inputs (Level 2) | Collateralized loan obligations
Assets:
Estimated fair value	1,012.8	1,032.8
Trading securities	9.5	9.0
Fair value, Measurements, Recurring | Significant other observable inputs (Level 2) | Commercial mortgage-backed securities
Assets:
Estimated fair value	2,193.4	2,205.0
Trading securities	103.7	118.9
Fair value, Measurements, Recurring | Significant other observable inputs (Level 2) | Total fixed maturities, available for sale
Assets:
Estimated fair value	22,684.6	21,308.3
Fair value, Measurements, Recurring | Significant unobservable inputs  (Level 3)
Assets:
Trading securities	0.0	0.0
Investments held by variable interest entities	0.0	0.0
Derivatives	0.0	0.0
Residual tranches	95.4	31.5
Total other invested assets	95.4	31.5
Assets held in separate accounts	0.0	0.0
Total assets carried at fair value by category	324.7	302.1
Liabilities:
Market risk benefit liability	60.0	117.1
Embedded derivatives associated with fixed indexed annuity products	1,493.2	1,376.7
Total liabilities carried at fair value by category	1,553.2	1,493.8
Fair value, Measurements, Recurring | Significant unobservable inputs  (Level 3) | Corporate securities
Assets:
Estimated fair value	128.0	159.3
Equity securities - corporate securities	73.4	72.7
Fair value, Measurements, Recurring | Significant unobservable inputs  (Level 3) | Certificates of deposit
Assets:
Estimated fair value	0.0	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:
Estimated fair value	0.0	0.0
Fair value, Measurements, Recurring | Significant unobservable inputs  (Level 3) | States and political subdivisions
Assets:
Estimated fair value	0.0	0.0
Fair value, Measurements, Recurring | Significant unobservable inputs  (Level 3) | Foreign governments
Assets:
Estimated fair value	0.0	0.0
Fair value, Measurements, Recurring | Significant unobservable inputs  (Level 3) | Asset-backed securities
Assets:
Estimated fair value	19.8	25.5
Trading securities	0.0	0.0
Fair value, Measurements, Recurring | Significant unobservable inputs  (Level 3) | Agency residential mortgage-backed securities
Assets:
Estimated fair value	0.0	0.0
Trading securities	0.0	0.0
Fair value, Measurements, Recurring | Significant unobservable inputs  (Level 3) | Non-agency residential mortgage-backed securities
Assets:
Estimated fair value	0.0	0.0
Trading securities	0.0	0.0
Fair value, Measurements, Recurring | Significant unobservable inputs  (Level 3) | Collateralized loan obligations
Assets:
Estimated fair value	4.0	0.0
Trading securities	0.0	0.0
Fair value, Measurements, Recurring | Significant unobservable inputs  (Level 3) | Commercial mortgage-backed securities
Assets:
Estimated fair value	4.1	13.1
Trading securities	0.0	0.0
Fair value, Measurements, Recurring | Significant unobservable inputs  (Level 3) | Total fixed maturities, available for sale
Assets:
Estimated fair value	$ 155.9	$ 197.9

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