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LIABILITIES FOR INSURANCE PRODUCTS - GUARANTEED MINIMUM CREDITING RATES (Details) $ in Millions	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Mar. 31, 2024 USD ($)
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 17,803.1		$ 15,736.7
Amount of reserves above (below) policyholder account values	(457.1)		(375.6)
Policyholder account balances	17,346.0	$ 17,615.8	15,361.1
0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 1,757.9		$ 1,757.0
0.00%-2.99% | Minimum
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	0.00%		0.00%
0.00%-2.99% | Maximum
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	2.99%		2.99%
3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 2,201.0		$ 2,180.1
3.00%-4.99% | Minimum
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	3.00%		3.00%
3.00%-4.99% | Maximum
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	4.99%		4.99%
5.00% and greater
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 141.9		$ 144.2
5.00% and greater | Minimum
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	5.00%		5.00%
At guaranteed minimum | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 145.5		$ 171.5
At guaranteed minimum | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	1,665.9		1,892.1
At guaranteed minimum | 5.00% and greater
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 141.4		$ 143.7
1-50 basis points above | Minimum
Policyholder Account Balance [Line Items]
Policyholder account balance, above guaranteed minimum crediting rate	0.0001		0.0001
1-50 basis points above | Maximum
Policyholder Account Balance [Line Items]
Policyholder account balance, above guaranteed minimum crediting rate	0.0050		0.0050
1-50 basis points above | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 538.9		$ 579.0
1-50 basis points above | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	146.9		99.3
1-50 basis points above | 5.00% and greater
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 0.5		$ 0.5
51-150 basis points above | Minimum
Policyholder Account Balance [Line Items]
Policyholder account balance, above guaranteed minimum crediting rate	0.0051		0.0051
51-150 basis points above | Maximum
Policyholder Account Balance [Line Items]
Policyholder account balance, above guaranteed minimum crediting rate	0.0150		0.0150
51-150 basis points above | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 282.7		$ 238.4
51-150 basis points above | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	359.5		183.0
51-150 basis points above | 5.00% and greater
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 0.0		$ 0.0
Greater than 150 basis points above | Minimum
Policyholder Account Balance [Line Items]
Policyholder account balance, above guaranteed minimum crediting rate	0.0150		0.0150
Greater than 150 basis points above | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 790.8		$ 768.1
Greater than 150 basis points above | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	28.7		5.7
Greater than 150 basis points above | 5.00% and greater
Policyholder Account Balance [Line Items]
Total policyholder account values	0.0		0.0
Contracts Excluding Fixed Indexed Annuities
Policyholder Account Balance [Line Items]
Total policyholder account values	4,100.8		4,081.3
Contracts Excluding Fixed Indexed Annuities | At guaranteed minimum
Policyholder Account Balance [Line Items]
Total policyholder account values	1,952.8		2,207.3
Contracts Excluding Fixed Indexed Annuities | 1-50 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	686.3		678.8
Contracts Excluding Fixed Indexed Annuities | 51-150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	642.2		421.4
Contracts Excluding Fixed Indexed Annuities | Greater than 150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	819.5		773.8
Fixed interest annuities
Policyholder Account Balance [Line Items]
Total policyholder account values	2,168.0		2,189.9
Amount of reserves above (below) policyholder account values	0.0
Policyholder account balances	2,168.0		2,189.9
Fixed interest annuities | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 618.4		$ 651.0
Fixed interest annuities | 0.00%-2.99% | Minimum
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	0.00%		0.00%
Fixed interest annuities | 0.00%-2.99% | Maximum
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	2.99%		2.99%
Fixed interest annuities | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 1,466.8		$ 1,451.3
Fixed interest annuities | 3.00%-4.99% | Minimum
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	3.00%		3.00%
Fixed interest annuities | 3.00%-4.99% | Maximum
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	4.99%		4.99%
Fixed interest annuities | 5.00% and greater
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 82.8		$ 87.6
Fixed interest annuities | 5.00% and greater | Minimum
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	5.00%		5.00%
Fixed interest annuities | At guaranteed minimum
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 1,401.6		$ 1,573.4
Fixed interest annuities | At guaranteed minimum | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	88.3		105.2
Fixed interest annuities | At guaranteed minimum | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	1,230.5		1,380.6
Fixed interest annuities | At guaranteed minimum | 5.00% and greater
Policyholder Account Balance [Line Items]
Total policyholder account values	82.8		87.6
Fixed interest annuities | 1-50 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	223.4		261.5
Fixed interest annuities | 1-50 basis points above | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	188.6		211.9
Fixed interest annuities | 1-50 basis points above | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	34.8		49.6
Fixed interest annuities | 1-50 basis points above | 5.00% and greater
Policyholder Account Balance [Line Items]
Total policyholder account values	0.0		0.0
Fixed interest annuities | 51-150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	456.7		248.9
Fixed interest annuities | 51-150 basis points above | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	282.3		233.0
Fixed interest annuities | 51-150 basis points above | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	174.4		15.9
Fixed interest annuities | 51-150 basis points above | 5.00% and greater
Policyholder Account Balance [Line Items]
Total policyholder account values	0.0		0.0
Fixed interest annuities | Greater than 150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	86.3		106.1
Fixed interest annuities | Greater than 150 basis points above | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	59.2		100.9
Fixed interest annuities | Greater than 150 basis points above | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	27.1		5.2
Fixed interest annuities | Greater than 150 basis points above | 5.00% and greater
Policyholder Account Balance [Line Items]
Total policyholder account values	0.0		0.0
Other annuities
Policyholder Account Balance [Line Items]
Total policyholder account values	133.0		134.6
Other annuities | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 47.3		$ 55.7
Other annuities | 0.00%-2.99% | Minimum
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	0.00%		0.00%
Other annuities | 0.00%-2.99% | Maximum
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	2.99%		2.99%
Other annuities | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 48.0		$ 44.4
Other annuities | 3.00%-4.99% | Minimum
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	3.00%		3.00%
Other annuities | 3.00%-4.99% | Maximum
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	4.99%		4.99%
Other annuities | 5.00% and greater
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 37.7		$ 34.5
Other annuities | 5.00% and greater | Minimum
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	5.00%		5.00%
Other annuities | At guaranteed minimum
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 110.6		$ 110.5
Other annuities | At guaranteed minimum | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	24.9		31.6
Other annuities | At guaranteed minimum | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	48.0		44.4
Other annuities | At guaranteed minimum | 5.00% and greater
Policyholder Account Balance [Line Items]
Total policyholder account values	37.7		34.5
Other annuities | 1-50 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	22.4		24.1
Other annuities | 1-50 basis points above | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	22.4		24.1
Other annuities | 1-50 basis points above | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	0.0		0.0
Other annuities | 1-50 basis points above | 5.00% and greater
Policyholder Account Balance [Line Items]
Total policyholder account values	0.0		0.0
Other annuities | 51-150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	0.0		0.0
Other annuities | 51-150 basis points above | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	0.0		0.0
Other annuities | 51-150 basis points above | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	0.0		0.0
Other annuities | 51-150 basis points above | 5.00% and greater
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 | Greater than 150 basis points above | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	0.0		0.0
Other annuities | Greater than 150 basis points above | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	0.0		0.0
Other annuities | Greater than 150 basis points above | 5.00% and greater
Policyholder Account Balance [Line Items]
Total policyholder account values	0.0		0.0
Interest-sensitive life
Policyholder Account Balance [Line Items]
Total policyholder account values	1,434.0		1,373.6
Amount of reserves above (below) policyholder account values	5.3		22.8
Policyholder account balances	1,439.4		1,396.4
Interest-sensitive life | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 747.8		$ 690.2
Interest-sensitive life | 0.00%-2.99% | Minimum
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	0.00%		0.00%
Interest-sensitive life | 0.00%-2.99% | Maximum
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	2.99%		2.99%
Interest-sensitive life | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 665.1		$ 661.5
Interest-sensitive life | 3.00%-4.99% | Minimum
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	3.00%		3.00%
Interest-sensitive life | 3.00%-4.99% | Maximum
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	4.99%		4.99%
Interest-sensitive life | 5.00% and greater
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 21.1		$ 21.9
Interest-sensitive life | 5.00% and greater | Minimum
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	5.00%		5.00%
Interest-sensitive life | At guaranteed minimum
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 402.7		$ 483.2
Interest-sensitive life | At guaranteed minimum | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	15.8		17.6
Interest-sensitive life | At guaranteed minimum | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	366.3		444.2
Interest-sensitive life | At guaranteed minimum | 5.00% and greater
Policyholder Account Balance [Line Items]
Total policyholder account values	20.6		21.4
Interest-sensitive life | 1-50 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	112.6		50.2
Interest-sensitive life | 1-50 basis points above | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	0.0		0.0
Interest-sensitive life | 1-50 basis points above | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	112.1		49.7
Interest-sensitive life | 1-50 basis points above | 5.00% and greater
Policyholder Account Balance [Line Items]
Total policyholder account values	0.5		0.5
Interest-sensitive life | 51-150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	185.5		172.5
Interest-sensitive life | 51-150 basis points above | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	0.4		5.4
Interest-sensitive life | 51-150 basis points above | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	185.1		167.1
Interest-sensitive life | 51-150 basis points above | 5.00% and greater
Policyholder Account Balance [Line Items]
Total policyholder account values	0.0		0.0
Interest-sensitive life | Greater than 150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	733.2		667.7
Interest-sensitive life | Greater than 150 basis points above | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	731.6		667.2
Interest-sensitive life | Greater than 150 basis points above | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	1.6		0.5
Interest-sensitive life | Greater than 150 basis points above | 5.00% and greater
Policyholder Account Balance [Line Items]
Total policyholder account values	0.0		0.0
Other
Policyholder Account Balance [Line Items]
Total policyholder account values	365.8		383.2
Amount of reserves above (below) policyholder account values	0.0
Policyholder account balances	365.8		383.2
Other | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 344.4		$ 360.1
Other | 0.00%-2.99% | Minimum
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	0.00%		0.00%
Other | 0.00%-2.99% | Maximum
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	2.99%		2.99%
Other | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 21.1		$ 22.9
Other | 3.00%-4.99% | Minimum
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	3.00%		3.00%
Other | 3.00%-4.99% | Maximum
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	4.99%		4.99%
Other | 5.00% and greater
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 0.3		$ 0.2
Other | 5.00% and greater | Minimum
Policyholder Account Balance [Line Items]
Range of guaranteed minimum crediting rates	5.00%		5.00%
Other | At guaranteed minimum
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 37.9		$ 40.2
Other | At guaranteed minimum | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	16.5		17.1
Other | At guaranteed minimum | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	21.1		22.9
Other | At guaranteed minimum | 5.00% and greater
Policyholder Account Balance [Line Items]
Total policyholder account values	0.3		0.2
Other | 1-50 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	327.9		343.0
Other | 1-50 basis points above | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	327.9		343.0
Other | 1-50 basis points above | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	0.0		0.0
Other | 1-50 basis points above | 5.00% and greater
Policyholder Account Balance [Line Items]
Total policyholder account values	0.0		0.0
Other | 51-150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	0.0		0.0
Other | 51-150 basis points above | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	0.0		0.0
Other | 51-150 basis points above | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	0.0		0.0
Other | 51-150 basis points above | 5.00% and greater
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 | Greater than 150 basis points above | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	0.0		0.0
Other | Greater than 150 basis points above | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	0.0		0.0
Other | Greater than 150 basis points above | 5.00% and greater
Policyholder Account Balance [Line Items]
Total policyholder account values	0.0		0.0
Fixed indexed annuities
Policyholder Account Balance [Line Items]
Total policyholder account values	11,073.8		10,247.1
Amount of reserves above (below) policyholder account values	(462.4)		(398.4)
Policyholder account balances	10,611.3		9,848.7
Funding agreements
Policyholder Account Balance [Line Items]
Total policyholder account values	2,628.5		1,408.3
Amount of reserves above (below) policyholder account values	0.0
Policyholder account balances	$ 2,628.5		$ 1,408.3

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