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FAIR VALUE MEASUREMENTS - MEASUREMENTS BY INPUT LEVEL (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020	Jan. 01, 2020
Assets:
Fixed maturities, available for sale	$ 23,806.6	$ 23,383.6	$ 21,293.1
Equity securities - corporate securities	149.3	151.2
Total trading securities	247.0	232.0
Investments held by variable interest entities - corporate securities	1,233.5	1,189.4	$ 1,178.7
Assets held in separate accounts	4.5	4.2
Corporate securities
Assets:
Fixed maturities, available for sale	15,243.5	14,739.2
United States Treasury securities and obligations of United States government corporations and agencies
Assets:
Fixed maturities, available for sale	214.6	235.5
States and political subdivisions
Assets:
Fixed maturities, available for sale	2,800.9	2,653.9
Foreign governments
Assets:
Fixed maturities, available for sale	80.0	102.8
Asset-backed securities
Assets:
Fixed maturities, available for sale	1,012.1	1,062.1
Agency residential mortgage-backed securities
Assets:
Fixed maturities, available for sale	49.6	58.4
Non-agency residential mortgage-backed securities
Assets:
Fixed maturities, available for sale	1,905.3	2,092.6
Collateralized loan obligations
Assets:
Fixed maturities, available for sale	459.6	458.9
Commercial mortgage-backed securities
Assets:
Fixed maturities, available for sale	2,041.0	1,980.2
Significant unobservable inputs  (Level 3)
Assets:
Total assets carried at fair value by category	138.9	212.5
Fair Value, Measurements, Recurring
Assets:
Fixed maturities, available for sale	23,806.6	23,383.6
Total trading securities	247.0	232.0
Investments held by variable interest entities - corporate securities	1,233.5	1,189.4
Other invested assets - derivatives	255.8	216.7
Assets held in separate accounts	4.5	4.2
Total assets carried at fair value by category	25,696.7	25,177.1
Liabilities:
Embedded derivatives associated with fixed index annuity products (classified as policyholder account liabilities)	1,695.0	1,644.5
Fair Value, Measurements, Recurring | Corporate securities
Assets:
Fixed maturities, available for sale	15,243.5	14,739.2
Equity securities - corporate securities	149.3	151.2
Fair Value, Measurements, Recurring | United States Treasury securities and obligations of United States government corporations and agencies
Assets:
Fixed maturities, available for sale	214.6	235.5
Fair Value, Measurements, Recurring | States and political subdivisions
Assets:
Fixed maturities, available for sale	2,800.9	2,653.9
Fair Value, Measurements, Recurring | Foreign governments
Assets:
Fixed maturities, available for sale	80.0	102.8
Fair Value, Measurements, Recurring | Asset-backed securities
Assets:
Fixed maturities, available for sale	1,012.1	1,062.1
Total trading securities	7.9	10.4
Fair Value, Measurements, Recurring | Agency residential mortgage-backed securities
Assets:
Fixed maturities, available for sale	49.6	58.4
Total trading securities	0.4	0.4
Fair Value, Measurements, Recurring | Non-agency residential mortgage-backed securities
Assets:
Fixed maturities, available for sale	1,905.3	2,092.6
Total trading securities	90.1	97.9
Fair Value, Measurements, Recurring | Collateralized loan obligations
Assets:
Fixed maturities, available for sale	459.6	458.9
Fair Value, Measurements, Recurring | Commercial mortgage-backed securities
Assets:
Fixed maturities, available for sale	2,041.0	1,980.2
Total trading securities	148.6	123.3
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets or liabilities (Level 1)
Assets:
Fixed maturities, available for sale	0.0	0.0
Total trading securities	0.0	0.0
Investments held by variable interest entities - corporate securities	0.0	0.0
Other invested assets - derivatives	0.0	0.0
Assets held in separate accounts	0.0	0.0
Total assets carried at fair value by category	102.5	104.6
Liabilities:
Embedded derivatives associated with fixed index annuity products (classified as policyholder account liabilities)	0.0	0.0
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets or liabilities (Level 1) | Corporate securities
Assets:
Fixed maturities, available for sale	0.0	0.0
Equity securities - corporate securities	102.5	104.6
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:
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:
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:
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:
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:
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:
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:
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) | Commercial mortgage-backed securities
Assets:
Fixed maturities, available for sale	0.0	0.0
Total trading securities	0.0	0.0
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)
Assets:
Fixed maturities, available for sale	23,712.1	23,220.8
Total trading securities	229.6	209.1
Investments held by variable interest entities - corporate securities	1,233.5	1,189.4
Other invested assets - derivatives	255.8	216.7
Assets held in separate accounts	4.5	4.2
Total assets carried at fair value by category	25,455.3	24,860.0
Liabilities:
Embedded derivatives associated with fixed index annuity products (classified as policyholder account liabilities)	0.0	0.0
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Corporate securities
Assets:
Fixed maturities, available for sale	15,161.0	14,592.3
Equity securities - corporate securities	19.8	19.8
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | United States Treasury securities and obligations of United States government corporations and agencies
Assets:
Fixed maturities, available for sale	214.6	235.5
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | States and political subdivisions
Assets:
Fixed maturities, available for sale	2,800.9	2,653.9
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Foreign governments
Assets:
Fixed maturities, available for sale	80.0	102.8
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Asset-backed securities
Assets:
Fixed maturities, available for sale	1,000.1	1,047.8
Total trading securities	7.9	10.4
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Agency residential mortgage-backed securities
Assets:
Fixed maturities, available for sale	49.6	58.4
Total trading securities	0.4	0.4
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Non-agency residential mortgage-backed securities
Assets:
Fixed maturities, available for sale	1,905.3	2,091.0
Total trading securities	85.3	92.0
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Collateralized loan obligations
Assets:
Fixed maturities, available for sale	459.6	458.9
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Commercial mortgage-backed securities
Assets:
Fixed maturities, available for sale	2,041.0	1,980.2
Total trading securities	136.0	106.3
Fair Value, Measurements, Recurring | Significant unobservable inputs  (Level 3)
Assets:
Fixed maturities, available for sale	94.5	162.8
Total trading securities	17.4	22.9
Investments held by variable interest entities - corporate securities	0.0	0.0
Other invested assets - derivatives	0.0	0.0
Assets held in separate accounts	0.0	0.0
Total assets carried at fair value by category	138.9	212.5
Liabilities:
Embedded derivatives associated with fixed index annuity products (classified as policyholder account liabilities)	1,695.0	1,644.5
Fair Value, Measurements, Recurring | Significant unobservable inputs  (Level 3) | Corporate securities
Assets:
Fixed maturities, available for sale	82.5	146.9
Equity securities - corporate securities	27.0	26.8
Fair Value, Measurements, Recurring | Significant unobservable inputs  (Level 3) | United States Treasury securities and obligations of United States government corporations and agencies
Assets:
Fixed maturities, available for sale	0.0	0.0
Fair Value, Measurements, Recurring | Significant unobservable inputs  (Level 3) | States and political subdivisions
Assets:
Fixed maturities, available for sale	0.0	0.0
Fair Value, Measurements, Recurring | Significant unobservable inputs  (Level 3) | Foreign governments
Assets:
Fixed maturities, available for sale	0.0	0.0
Fair Value, Measurements, Recurring | Significant unobservable inputs  (Level 3) | Asset-backed securities
Assets:
Fixed maturities, available for sale	12.0	14.3
Total trading securities	0.0	0.0
Fair Value, Measurements, Recurring | Significant unobservable inputs  (Level 3) | Agency residential mortgage-backed securities
Assets:
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:
Fixed maturities, available for sale	0.0	1.6
Total trading securities	4.8	5.9
Fair Value, Measurements, Recurring | Significant unobservable inputs  (Level 3) | Collateralized loan obligations
Assets:
Fixed maturities, available for sale	0.0	0.0
Fair Value, Measurements, Recurring | Significant unobservable inputs  (Level 3) | Commercial mortgage-backed securities
Assets:
Fixed maturities, available for sale	0.0	0.0
Total trading securities	$ 12.6	$ 17.0

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