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LIABILITIES FOR INSURANCE PRODUCTS - GUARANTEED MINIMUM CREDITING RATES (Details) $ in Millions	Sep. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)	Sep. 30, 2024 USD ($)
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 18,624.7		$ 17,240.5
Amount of reserves above (below) policyholder account values	(334.4)		(248.1)
Policyholder account balances	18,290.3	$ 17,594.2	16,992.4
0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 1,831.0		$ 1,739.0
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	$ 2,133.7		$ 2,196.7
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	$ 132.2		$ 136.3
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	$ 143.0		$ 161.0
At guaranteed minimum | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	1,626.7		1,793.0
At guaranteed minimum | 5.00% and greater
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 132.0		$ 135.8
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		$ 561.9
1-50 basis points above | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	207.7		98.4
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	$ 331.5		$ 233.3
51-150 basis points above | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	285.7		283.4
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	$ 830.0		$ 782.8
Greater than 150 basis points above | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	13.6		21.9
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	4,096.9		4,072.0
Contracts Excluding Fixed Indexed Annuities | At guaranteed minimum
Policyholder Account Balance [Line Items]
Total policyholder account values	1,901.7		2,089.8
Contracts Excluding Fixed Indexed Annuities | 1-50 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	734.4		660.8
Contracts Excluding Fixed Indexed Annuities | 51-150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	617.2		516.7
Contracts Excluding Fixed Indexed Annuities | Greater than 150 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	843.6		804.7
Fixed interest annuities
Policyholder Account Balance [Line Items]
Total policyholder account values	2,138.9		2,160.4
Amount of reserves above (below) policyholder account values	0.0		0.0
Policyholder account balances	2,138.9		2,160.4
Fixed interest annuities | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 673.4		$ 613.3
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	$ 1,387.4		$ 1,465.6
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	$ 78.1		$ 81.5
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	$ 1,351.7		$ 1,464.4
Fixed interest annuities | At guaranteed minimum | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	85.7		96.0
Fixed interest annuities | At guaranteed minimum | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	1,187.9		1,286.9
Fixed interest annuities | At guaranteed minimum | 5.00% and greater
Policyholder Account Balance [Line Items]
Total policyholder account values	78.1		81.5
Fixed interest annuities | 1-50 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	279.4		252.9
Fixed interest annuities | 1-50 basis points above | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	182.7		203.5
Fixed interest annuities | 1-50 basis points above | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	96.7		49.4
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	422.3		341.2
Fixed interest annuities | 51-150 basis points above | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	331.0		232.8
Fixed interest annuities | 51-150 basis points above | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	91.3		108.4
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	85.5		101.9
Fixed interest annuities | Greater than 150 basis points above | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	74.0		81.0
Fixed interest annuities | Greater than 150 basis points above | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	11.5		20.9
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	135.2		136.0
Other annuities | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 44.8		$ 57.4
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	$ 57.0		$ 45.4
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	$ 33.4		$ 33.2
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	$ 114.1		$ 112.5
Other annuities | At guaranteed minimum | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	23.7		33.9
Other annuities | At guaranteed minimum | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	57.0		45.4
Other annuities | At guaranteed minimum | 5.00% and greater
Policyholder Account Balance [Line Items]
Total policyholder account values	33.4		33.2
Other annuities | 1-50 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	21.1		23.5
Other annuities | 1-50 basis points above | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	21.1		23.5
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	1,463.1		1,401.1
Amount of reserves above (below) policyholder account values	18.5		24.6
Policyholder account balances	1,481.6		1,425.7
Interest-sensitive life | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 774.1		$ 716.6
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	$ 668.6		$ 663.1
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	$ 20.4		$ 21.4
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	$ 398.9		$ 473.3
Interest-sensitive life | At guaranteed minimum | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	17.6		14.3
Interest-sensitive life | At guaranteed minimum | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	361.1		438.1
Interest-sensitive life | At guaranteed minimum | 5.00% and greater
Policyholder Account Balance [Line Items]
Total policyholder account values	20.2		20.9
Interest-sensitive life | 1-50 basis points above
Policyholder Account Balance [Line Items]
Total policyholder account values	111.2		49.5
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	111.0		49.0
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	194.9		175.5
Interest-sensitive life | 51-150 basis points above | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	0.5		0.5
Interest-sensitive life | 51-150 basis points above | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	194.4		175.0
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	758.1		702.8
Interest-sensitive life | Greater than 150 basis points above | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	756.0		701.8
Interest-sensitive life | Greater than 150 basis points above | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	2.1		1.0
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	359.7		374.5
Amount of reserves above (below) policyholder account values	0.0		0.0
Policyholder account balances	359.7		374.5
Other | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	$ 338.7		$ 351.7
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	$ 20.7		$ 22.6
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	$ 37.0		$ 39.6
Other | At guaranteed minimum | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	16.0		16.8
Other | At guaranteed minimum | 3.00%-4.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	20.7		22.6
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	322.7		334.9
Other | 1-50 basis points above | 0.00%-2.99%
Policyholder Account Balance [Line Items]
Total policyholder account values	322.7		334.9
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	11,548.2		10,594.8
Amount of reserves above (below) policyholder account values	(352.9)		(272.7)
Policyholder account balances	11,195.3		10,322.1
Funding Agreement Backed Notes
Policyholder Account Balance [Line Items]
Total policyholder account values	2,979.6		2,573.7
Amount of reserves above (below) policyholder account values	0.0		0.0
Policyholder account balances	$ 2,979.6		$ 2,573.7

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