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LIABILITIES FOR INSURANCE PRODUCTS - GUARANTEED MINIMUM CREDITING RATES (Details) $ in Millions	Mar. 31, 2026 USD ($)	Dec. 31, 2025 USD ($)	Mar. 31, 2025 USD ($)
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 19,368.2		$ 17,803.1
Amount of reserves above (below) policyholder account values	(370.9)		(488.8)
Policyholder account balances	18,997.3	$ 18,912.6	17,314.3
0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 1,886.6		$ 1,757.9
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	$ 2,064.1		$ 2,201.0
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	$ 131.5		$ 141.9
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	$ 150.5		$ 145.5
At guaranteed minimum | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	1,664.7		1,665.9
At guaranteed minimum | 5.00% and greater
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 131.3		$ 141.4
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	$ 526.5		$ 538.9
1-50 basis points above | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	190.3		146.9
1-50 basis points above | 5.00% and greater
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 0.2		$ 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	$ 353.9		$ 282.7
51-150 basis points above | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	206.1		359.5
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	$ 855.7		$ 790.8
Greater than 150 basis points above | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	3.0		28.7
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	4,082.2		4,100.8
Contracts Excluding Fixed Indexed Annuities | At guaranteed minimum
Policyholder Account Balance [Line Items]
Total policyholder account values	1,946.5		1,952.8
Contracts Excluding Fixed Indexed Annuities | 1-50 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	717.0		686.3
Contracts Excluding Fixed Indexed Annuities | 51-150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	560.0		642.2
Contracts Excluding Fixed Indexed Annuities | Greater than 150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	858.7		819.5
Fixed interest annuities
Policyholder Account Balance [Line Items]
Total policyholder account values	2,104.8		2,168.0
Amount of reserves above (below) policyholder account values	0.0		0.0
Policyholder account balances	2,104.8		2,168.0
Fixed interest annuities | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 715.5		$ 618.4
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	$ 1,313.0		$ 1,466.8
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	$ 76.3		$ 82.8
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	$ 1,386.1		$ 1,401.6
Fixed interest annuities | At guaranteed minimum | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	95.1		88.3
Fixed interest annuities | At guaranteed minimum | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	1,214.7		1,230.5
Fixed interest annuities | At guaranteed minimum | 5.00% and greater
Policyholder Account Balance [Line Items]
Total policyholder account values	76.3		82.8
Fixed interest annuities | 1-50 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	287.7		223.4
Fixed interest annuities | 1-50 basis points above | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	190.0		188.6
Fixed interest annuities | 1-50 basis points above | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	97.7		34.8
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	354.0		456.7
Fixed interest annuities | 51-150 basis points above | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	353.4		282.3
Fixed interest annuities | 51-150 basis points above | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	0.6		174.4
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	77.0		86.3
Fixed interest annuities | Greater than 150 basis points above | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	77.0		59.2
Fixed interest annuities | Greater than 150 basis points above | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	0.0		27.1
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	132.4		133.0
Other annuities | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 40.1		$ 47.3
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	$ 57.4		$ 48.0
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	$ 34.9		$ 37.7
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	$ 113.0		$ 110.6
Other annuities | At guaranteed minimum | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	20.7		24.9
Other annuities | At guaranteed minimum | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	57.4		48.0
Other annuities | At guaranteed minimum | 5.00% and greater
Policyholder Account Balance [Line Items]
Total policyholder account values	34.9		37.7
Other annuities | 1-50 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	19.4		22.4
Other annuities | 1-50 basis points above | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	19.4		22.4
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	1,491.8		1,434.0
Amount of reserves above (below) policyholder account values	10.3		5.3
Policyholder account balances	1,502.1		1,439.4
Interest-sensitive life | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 798.1		$ 747.8
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	$ 673.7		$ 665.1
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	$ 20.0		$ 21.1
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	$ 411.3		$ 402.7
Interest-sensitive life | At guaranteed minimum | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	18.9		15.8
Interest-sensitive life | At guaranteed minimum | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	372.6		366.3
Interest-sensitive life | At guaranteed minimum | 5.00% and greater
Policyholder Account Balance [Line Items]
Total policyholder account values	19.8		20.6
Interest-sensitive life | 1-50 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	92.8		112.6
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	92.6		112.1
Interest-sensitive life | 1-50 basis points above | 5.00% and greater
Policyholder Account Balance [Line Items]
Total policyholder account values	0.2		0.5
Interest-sensitive life | 51-150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	206.0		185.5
Interest-sensitive life | 51-150 basis points above | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	0.5		0.4
Interest-sensitive life | 51-150 basis points above | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	205.5		185.1
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	781.7		733.2
Interest-sensitive life | Greater than 150 basis points above | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	778.7		731.6
Interest-sensitive life | Greater than 150 basis points above | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	3.0		1.6
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	353.2		365.8
Amount of reserves above (below) policyholder account values	0.0		0.0
Policyholder account balances	353.2		365.8
Other | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 332.9		$ 344.4
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	$ 20.0		$ 21.1
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		$ 0.3
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	$ 36.1		$ 37.9
Other | At guaranteed minimum | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	15.8		16.5
Other | At guaranteed minimum | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	20.0		21.1
Other | At guaranteed minimum | 5.00% and greater
Policyholder Account Balance [Line Items]
Total policyholder account values	0.3		0.3
Other | 1-50 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	317.1		327.9
Other | 1-50 basis points above | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	317.1		327.9
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	11,901.0		11,073.8
Amount of reserves above (below) policyholder account values	(381.2)		(494.1)
Policyholder account balances	11,519.8		10,579.6
Funding Agreement Backed Notes
Policyholder Account Balance [Line Items]
Total policyholder account values	3,385.0		2,628.5
Amount of reserves above (below) policyholder account values	0.0		0.0
Policyholder account balances	$ 3,385.0		$ 2,628.5

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