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LIABILITIES FOR INSURANCE PRODUCTS - GUARANTEED MINIMUM CREDITING RATES (Details) $ in Millions	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 18,023.3	$ 15,667.8
Amount of reserves above (below) policyholder account values	(407.5)	(445.3)
Policyholder account balances	17,615.8	15,222.5
0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	1,726.4	1,780.7
0.00%-2.99% | At guaranteed minimum
Policyholder Account Balance [Line Items]
Total policyholder account values	151.7	180.8
0.00%-2.99% | 1-50 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	548.2	616.3
0.00%-2.99% | 51-150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	234.3	240.2
0.00%-2.99% | Greater than 150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	792.2	743.4
3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	2,245.1	2,194.5
3.00%-4.99% | At guaranteed minimum
Policyholder Account Balance [Line Items]
Total policyholder account values	1,696.3	1,954.4
3.00%-4.99% | 1-50 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	161.3	77.4
3.00%-4.99% | 51-150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	356.3	162.2
3.00%-4.99% | Greater than 150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	31.2	0.5
5.00% and greater
Policyholder Account Balance [Line Items]
Total policyholder account values	140.3	143.0
5.00% and greater | At guaranteed minimum
Policyholder Account Balance [Line Items]
Total policyholder account values	139.8	142.5
5.00% and greater | 1-50 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	0.5	0.5
5.00% and greater | 51-150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	0.0	0.0
5.00% and greater | Greater than 150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 0.0	$ 0.0
Minimum | 1-50 basis points above
Policyholder Account Balance [Line Items]
Policyholder account balance, above guaranteed minimum crediting rate	0.0001	0.0001
Minimum | 51-150 basis points above
Policyholder Account Balance [Line Items]
Policyholder account balance, above guaranteed minimum crediting rate	0.0051	0.0051
Minimum | Greater than 150 basis points above
Policyholder Account Balance [Line Items]
Policyholder account balance, above guaranteed minimum crediting rate	0.0150	0.0150
Minimum | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	0.00%	0.00%
Minimum | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	3.00%	3.00%
Minimum | 5.00% and greater
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	5.00%	5.00%
Maximum | 1-50 basis points above
Policyholder Account Balance [Line Items]
Policyholder account balance, above guaranteed minimum crediting rate	0.0050	0.0050
Maximum | 51-150 basis points above
Policyholder Account Balance [Line Items]
Policyholder account balance, above guaranteed minimum crediting rate	0.0150	0.0150
Maximum | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	2.99%	2.99%
Maximum | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	4.99%	4.99%
Fixed interest annuities
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 2,187.0	$ 2,228.8
Amount of reserves above (below) policyholder account values	0.0	0.0
Policyholder account balances	2,187.0	2,228.8
Fixed interest annuities | At guaranteed minimum
Policyholder Account Balance [Line Items]
Total policyholder account values	1,430.1	1,637.9
Fixed interest annuities | 1-50 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	243.0	259.9
Fixed interest annuities | 51-150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	410.6	225.3
Fixed interest annuities | Greater than 150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	103.3	105.7
Fixed interest annuities | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	594.6	676.5
Fixed interest annuities | 0.00%-2.99% | At guaranteed minimum
Policyholder Account Balance [Line Items]
Total policyholder account values	92.5	112.9
Fixed interest annuities | 0.00%-2.99% | 1-50 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	194.7	232.6
Fixed interest annuities | 0.00%-2.99% | 51-150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	233.9	225.3
Fixed interest annuities | 0.00%-2.99% | Greater than 150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	73.5	105.7
Fixed interest annuities | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	1,511.1	1,465.7
Fixed interest annuities | 3.00%-4.99% | At guaranteed minimum
Policyholder Account Balance [Line Items]
Total policyholder account values	1,256.3	1,438.4
Fixed interest annuities | 3.00%-4.99% | 1-50 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	48.3	27.3
Fixed interest annuities | 3.00%-4.99% | 51-150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	176.7	0.0
Fixed interest annuities | 3.00%-4.99% | Greater than 150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	29.8	0.0
Fixed interest annuities | 5.00% and greater
Policyholder Account Balance [Line Items]
Total policyholder account values	81.3	86.6
Fixed interest annuities | 5.00% and greater | At guaranteed minimum
Policyholder Account Balance [Line Items]
Total policyholder account values	81.3	86.6
Fixed interest annuities | 5.00% and greater | 1-50 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	0.0	0.0
Fixed interest annuities | 5.00% and greater | 51-150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	0.0	0.0
Fixed interest annuities | 5.00% and greater | Greater than 150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 0.0	$ 0.0
Fixed interest annuities | Minimum | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	0.00%	0.00%
Fixed interest annuities | Minimum | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	3.00%	3.00%
Fixed interest annuities | Minimum | 5.00% and greater
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	5.00%	5.00%
Fixed interest annuities | Maximum | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	2.99%	2.99%
Fixed interest annuities | Maximum | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	4.99%	4.99%
Other annuities
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 135.6	$ 138.3
Policyholder account balances	135.6	138.3
Other annuities | At guaranteed minimum
Policyholder Account Balance [Line Items]
Total policyholder account values	112.9	113.3
Other annuities | 1-50 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	22.7	25.0
Other annuities | 51-150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	0.0	0.0
Other annuities | Greater than 150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	0.0	0.0
Other annuities | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	50.0	59.4
Other annuities | 0.00%-2.99% | At guaranteed minimum
Policyholder Account Balance [Line Items]
Total policyholder account values	27.3	34.4
Other annuities | 0.00%-2.99% | 1-50 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	22.7	25.0
Other annuities | 0.00%-2.99% | 51-150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	0.0	0.0
Other annuities | 0.00%-2.99% | Greater than 150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	0.0	0.0
Other annuities | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	47.9	44.9
Other annuities | 3.00%-4.99% | At guaranteed minimum
Policyholder Account Balance [Line Items]
Total policyholder account values	47.9	44.9
Other annuities | 3.00%-4.99% | 1-50 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	0.0	0.0
Other annuities | 3.00%-4.99% | 51-150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	0.0	0.0
Other annuities | 3.00%-4.99% | Greater than 150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	0.0	0.0
Other annuities | 5.00% and greater
Policyholder Account Balance [Line Items]
Total policyholder account values	37.7	34.0
Other annuities | 5.00% and greater | At guaranteed minimum
Policyholder Account Balance [Line Items]
Total policyholder account values	37.7	34.0
Other annuities | 5.00% and greater | 1-50 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	0.0	0.0
Other annuities | 5.00% and greater | 51-150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	0.0	0.0
Other annuities | 5.00% and greater | Greater than 150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 0.0	$ 0.0
Other annuities | Minimum | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	0.00%	0.00%
Other annuities | Minimum | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	3.00%	3.00%
Other annuities | Minimum | 5.00% and greater
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	5.00%	5.00%
Other annuities | Maximum | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	2.99%	2.99%
Other annuities | Maximum | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	4.99%	4.99%
Interest-sensitive life
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 1,420.0	$ 1,359.8
Amount of reserves above (below) policyholder account values	17.0	14.7
Policyholder account balances	1,437.0	1,374.5
Interest-sensitive life | At guaranteed minimum
Policyholder Account Balance [Line Items]
Total policyholder account values	406.4	486.0
Interest-sensitive life | 1-50 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	113.5	58.5
Interest-sensitive life | 51-150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	180.0	177.1
Interest-sensitive life | Greater than 150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	720.1	638.2
Interest-sensitive life | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	734.3	676.7
Interest-sensitive life | 0.00%-2.99% | At guaranteed minimum
Policyholder Account Balance [Line Items]
Total policyholder account values	15.2	16.2
Interest-sensitive life | 0.00%-2.99% | 1-50 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	0.0	7.9
Interest-sensitive life | 0.00%-2.99% | 51-150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	0.4	14.9
Interest-sensitive life | 0.00%-2.99% | Greater than 150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	718.7	637.7
Interest-sensitive life | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	664.6	660.9
Interest-sensitive life | 3.00%-4.99% | At guaranteed minimum
Policyholder Account Balance [Line Items]
Total policyholder account values	370.6	448.1
Interest-sensitive life | 3.00%-4.99% | 1-50 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	113.0	50.1
Interest-sensitive life | 3.00%-4.99% | 51-150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	179.6	162.2
Interest-sensitive life | 3.00%-4.99% | Greater than 150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	1.4	0.5
Interest-sensitive life | 5.00% and greater
Policyholder Account Balance [Line Items]
Total policyholder account values	21.1	22.2
Interest-sensitive life | 5.00% and greater | At guaranteed minimum
Policyholder Account Balance [Line Items]
Total policyholder account values	20.6	21.7
Interest-sensitive life | 5.00% and greater | 1-50 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	0.5	0.5
Interest-sensitive life | 5.00% and greater | 51-150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	0.0	0.0
Interest-sensitive life | 5.00% and greater | Greater than 150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 0.0	$ 0.0
Interest-sensitive life | Minimum | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	0.00%	0.00%
Interest-sensitive life | Minimum | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	3.00%	3.00%
Interest-sensitive life | Minimum | 5.00% and greater
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	5.00%	5.00%
Interest-sensitive life | Maximum | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	2.99%	2.99%
Interest-sensitive life | Maximum | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	4.99%	4.99%
Other
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 369.2	$ 391.3
Amount of reserves above (below) policyholder account values	0.0	0.0
Policyholder account balances	369.2	391.3
Other | At guaranteed minimum
Policyholder Account Balance [Line Items]
Total policyholder account values	38.4	40.5
Other | 1-50 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	330.8	350.8
Other | 51-150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	0.0	0.0
Other | Greater than 150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	0.0	0.0
Other | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	347.5	368.1
Other | 0.00%-2.99% | At guaranteed minimum
Policyholder Account Balance [Line Items]
Total policyholder account values	16.7	17.3
Other | 0.00%-2.99% | 1-50 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	330.8	350.8
Other | 0.00%-2.99% | 51-150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	0.0	0.0
Other | 0.00%-2.99% | Greater than 150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	0.0	0.0
Other | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	21.5	23.0
Other | 3.00%-4.99% | At guaranteed minimum
Policyholder Account Balance [Line Items]
Total policyholder account values	21.5	23.0
Other | 3.00%-4.99% | 1-50 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	0.0	0.0
Other | 3.00%-4.99% | 51-150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	0.0	0.0
Other | 3.00%-4.99% | Greater than 150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	0.0	0.0
Other | 5.00% and greater
Policyholder Account Balance [Line Items]
Total policyholder account values	0.2	0.2
Other | 5.00% and greater | At guaranteed minimum
Policyholder Account Balance [Line Items]
Total policyholder account values	0.2	0.2
Other | 5.00% and greater | 1-50 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	0.0	0.0
Other | 5.00% and greater | 51-150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	0.0	0.0
Other | 5.00% and greater | Greater than 150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 0.0	$ 0.0
Other | Minimum | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	0.00%	0.00%
Other | Minimum | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	3.00%	3.00%
Other | Minimum | 5.00% and greater
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	5.00%	5.00%
Other | Maximum | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	2.99%	2.99%
Other | Maximum | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	4.99%	4.99%
Contracts Excluding Fixed Indexed Annuities
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 4,111.8	$ 4,118.2
Contracts Excluding Fixed Indexed Annuities | At guaranteed minimum
Policyholder Account Balance [Line Items]
Total policyholder account values	1,987.8	2,277.7
Contracts Excluding Fixed Indexed Annuities | 1-50 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	710.0	694.2
Contracts Excluding Fixed Indexed Annuities | 51-150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	590.6	402.4
Contracts Excluding Fixed Indexed Annuities | Greater than 150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	823.4	743.9
Fixed indexed annuities
Policyholder Account Balance [Line Items]
Total policyholder account values	10,890.3	10,138.6
Amount of reserves above (below) policyholder account values	(424.5)	(460.0)
Policyholder account balances	10,465.8	9,678.6
Funding agreements
Policyholder Account Balance [Line Items]
Total policyholder account values	3,021.2	1,411.0
Amount of reserves above (below) policyholder account values	0.0	0.0
Policyholder account balances	$ 3,021.2	$ 1,411.0

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