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LIABILITIES FOR INSURANCE PRODUCTS - GUARANTEED MINIMUM CREDITING RATES (Details)
$ in Millions
Sep. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Sep. 30, 2023
USD ($)
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 17,240.5 $ 15,667.8 $ 15,481.8
0.00%-2.99%      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 1,739.0   $ 1,735.4
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]      
Policyholder account balances $ 2,196.7   $ 2,232.2
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]      
Policyholder account balances $ 136.3   $ 145.4
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]      
Policyholder account balances $ 161.0   $ 198.2
At guaranteed minimum | 3.00%-4.99%      
Policyholder Account Balance [Line Items]      
Policyholder account balances 1,793.0   1,996.6
At guaranteed minimum | 5.00% and greater      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 135.8   $ 144.9
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]      
Policyholder account balances $ 561.9   $ 671.1
1-50 basis points above | 3.00%-4.99%      
Policyholder Account Balance [Line Items]      
Policyholder account balances 98.4   77.6
1-50 basis points above | 5.00% and greater      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 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]      
Policyholder account balances $ 233.3   $ 481.9
51-150 basis points above | 3.00%-4.99%      
Policyholder Account Balance [Line Items]      
Policyholder account balances 283.4   157.5
51-150 basis points above | 5.00% and greater      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 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]      
Policyholder account balances $ 782.8   $ 384.2
Greater than 150 basis points above | 3.00%-4.99%      
Policyholder Account Balance [Line Items]      
Policyholder account balances 21.9   0.5
Greater than 150 basis points above | 5.00% and greater      
Policyholder Account Balance [Line Items]      
Policyholder account balances 0.0   0.0
Contracts Excluding Fixed Indexed Annuities      
Policyholder Account Balance [Line Items]      
Policyholder account balances 4,072.0   4,113.0
Contracts Excluding Fixed Indexed Annuities | At guaranteed minimum      
Policyholder Account Balance [Line Items]      
Policyholder account balances 2,089.8   2,339.7
Contracts Excluding Fixed Indexed Annuities | 1-50 basis points above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 660.8   749.2
Contracts Excluding Fixed Indexed Annuities | 51-150 basis points above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 516.7   639.4
Contracts Excluding Fixed Indexed Annuities | Greater than 150 basis points above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 804.7   384.7
Fixed interest annuities      
Policyholder Account Balance [Line Items]      
Policyholder account balances 2,160.4   2,234.7
Fixed interest annuities | 0.00%-2.99%      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 613.3   $ 642.2
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]      
Policyholder account balances $ 1,465.6   $ 1,502.9
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]      
Policyholder account balances $ 81.5   $ 89.6
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]      
Policyholder account balances $ 1,464.4   $ 1,687.7
Fixed interest annuities | At guaranteed minimum | 0.00%-2.99%      
Policyholder Account Balance [Line Items]      
Policyholder account balances 96.0   122.3
Fixed interest annuities | At guaranteed minimum | 3.00%-4.99%      
Policyholder Account Balance [Line Items]      
Policyholder account balances 1,286.9   1,475.8
Fixed interest annuities | At guaranteed minimum | 5.00% and greater      
Policyholder Account Balance [Line Items]      
Policyholder account balances 81.5   89.6
Fixed interest annuities | 1-50 basis points above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 252.9   284.5
Fixed interest annuities | 1-50 basis points above | 0.00%-2.99%      
Policyholder Account Balance [Line Items]      
Policyholder account balances 203.5   257.4
Fixed interest annuities | 1-50 basis points above | 3.00%-4.99%      
Policyholder Account Balance [Line Items]      
Policyholder account balances 49.4   27.1
Fixed interest annuities | 1-50 basis points above | 5.00% and greater      
Policyholder Account Balance [Line Items]      
Policyholder account balances 0.0   0.0
Fixed interest annuities | 51-150 basis points above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 341.2   183.4
Fixed interest annuities | 51-150 basis points above | 0.00%-2.99%      
Policyholder Account Balance [Line Items]      
Policyholder account balances 232.8   183.4
Fixed interest annuities | 51-150 basis points above | 3.00%-4.99%      
Policyholder Account Balance [Line Items]      
Policyholder account balances 108.4   0.0
Fixed interest annuities | 51-150 basis points above | 5.00% and greater      
Policyholder Account Balance [Line Items]      
Policyholder account balances 0.0   0.0
Fixed interest annuities | Greater than 150 basis points above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 101.9   79.1
Fixed interest annuities | Greater than 150 basis points above | 0.00%-2.99%      
Policyholder Account Balance [Line Items]      
Policyholder account balances 81.0   79.1
Fixed interest annuities | Greater than 150 basis points above | 3.00%-4.99%      
Policyholder Account Balance [Line Items]      
Policyholder account balances 20.9   0.0
Fixed interest annuities | Greater than 150 basis points above | 5.00% and greater      
Policyholder Account Balance [Line Items]      
Policyholder account balances 0.0   0.0
Other annuities      
Policyholder Account Balance [Line Items]      
Policyholder account balances 136.0   141.4
Other annuities | 0.00%-2.99%      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 57.4   $ 61.7
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]      
Policyholder account balances $ 45.4   $ 46.4
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]      
Policyholder account balances $ 33.2   $ 33.3
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]      
Policyholder account balances $ 112.5   $ 116.1
Other annuities | At guaranteed minimum | 0.00%-2.99%      
Policyholder Account Balance [Line Items]      
Policyholder account balances 33.9   36.4
Other annuities | At guaranteed minimum | 3.00%-4.99%      
Policyholder Account Balance [Line Items]      
Policyholder account balances 45.4   46.4
Other annuities | At guaranteed minimum | 5.00% and greater      
Policyholder Account Balance [Line Items]      
Policyholder account balances 33.2   33.3
Other annuities | 1-50 basis points above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 23.5   25.3
Other annuities | 1-50 basis points above | 0.00%-2.99%      
Policyholder Account Balance [Line Items]      
Policyholder account balances 23.5   25.3
Other annuities | 1-50 basis points above | 3.00%-4.99%      
Policyholder Account Balance [Line Items]      
Policyholder account balances 0.0   0.0
Other annuities | 1-50 basis points above | 5.00% and greater      
Policyholder Account Balance [Line Items]      
Policyholder account balances 0.0   0.0
Other annuities | 51-150 basis points above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 0.0   0.0
Other annuities | 51-150 basis points above | 0.00%-2.99%      
Policyholder Account Balance [Line Items]      
Policyholder account balances 0.0   0.0
Other annuities | 51-150 basis points above | 3.00%-4.99%      
Policyholder Account Balance [Line Items]      
Policyholder account balances 0.0   0.0
Other annuities | 51-150 basis points above | 5.00% and greater      
Policyholder Account Balance [Line Items]      
Policyholder account balances 0.0   0.0
Other annuities | Greater than 150 basis points above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 0.0   0.0
Other annuities | Greater than 150 basis points above | 0.00%-2.99%      
Policyholder Account Balance [Line Items]      
Policyholder account balances 0.0   0.0
Other annuities | Greater than 150 basis points above | 3.00%-4.99%      
Policyholder Account Balance [Line Items]      
Policyholder account balances 0.0   0.0
Other annuities | Greater than 150 basis points above | 5.00% and greater      
Policyholder Account Balance [Line Items]      
Policyholder account balances 0.0   0.0
Interest-sensitive life      
Policyholder Account Balance [Line Items]      
Policyholder account balances 1,401.1   1,344.8
Interest-sensitive life | 0.00%-2.99%      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 716.6   $ 662.8
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]      
Policyholder account balances $ 663.1   $ 659.7
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]      
Policyholder account balances $ 21.4   $ 22.3
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]      
Policyholder account balances $ 473.3   $ 495.0
Interest-sensitive life | At guaranteed minimum | 0.00%-2.99%      
Policyholder Account Balance [Line Items]      
Policyholder account balances 14.3   22.0
Interest-sensitive life | At guaranteed minimum | 3.00%-4.99%      
Policyholder Account Balance [Line Items]      
Policyholder account balances 438.1   451.2
Interest-sensitive life | At guaranteed minimum | 5.00% and greater      
Policyholder Account Balance [Line Items]      
Policyholder account balances 20.9   21.8
Interest-sensitive life | 1-50 basis points above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 49.5   88.2
Interest-sensitive life | 1-50 basis points above | 0.00%-2.99%      
Policyholder Account Balance [Line Items]      
Policyholder account balances 0.0   37.2
Interest-sensitive life | 1-50 basis points above | 3.00%-4.99%      
Policyholder Account Balance [Line Items]      
Policyholder account balances 49.0   50.5
Interest-sensitive life | 1-50 basis points above | 5.00% and greater      
Policyholder Account Balance [Line Items]      
Policyholder account balances 0.5   0.5
Interest-sensitive life | 51-150 basis points above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 175.5   456.0
Interest-sensitive life | 51-150 basis points above | 0.00%-2.99%      
Policyholder Account Balance [Line Items]      
Policyholder account balances 0.5   298.5
Interest-sensitive life | 51-150 basis points above | 3.00%-4.99%      
Policyholder Account Balance [Line Items]      
Policyholder account balances 175.0   157.5
Interest-sensitive life | 51-150 basis points above | 5.00% and greater      
Policyholder Account Balance [Line Items]      
Policyholder account balances 0.0   0.0
Interest-sensitive life | Greater than 150 basis points above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 702.8   305.6
Interest-sensitive life | Greater than 150 basis points above | 0.00%-2.99%      
Policyholder Account Balance [Line Items]      
Policyholder account balances 701.8   305.1
Interest-sensitive life | Greater than 150 basis points above | 3.00%-4.99%      
Policyholder Account Balance [Line Items]      
Policyholder account balances 1.0   0.5
Interest-sensitive life | Greater than 150 basis points above | 5.00% and greater      
Policyholder Account Balance [Line Items]      
Policyholder account balances 0.0   0.0
Other      
Policyholder Account Balance [Line Items]      
Policyholder account balances 374.5   392.1
Other | 0.00%-2.99%      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 351.7   $ 368.7
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]      
Policyholder account balances $ 22.6   $ 23.2
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]      
Policyholder account balances $ 0.2   $ 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]      
Policyholder account balances $ 39.6   $ 40.9
Other | At guaranteed minimum | 0.00%-2.99%      
Policyholder Account Balance [Line Items]      
Policyholder account balances 16.8   17.5
Other | At guaranteed minimum | 3.00%-4.99%      
Policyholder Account Balance [Line Items]      
Policyholder account balances 22.6   23.2
Other | At guaranteed minimum | 5.00% and greater      
Policyholder Account Balance [Line Items]      
Policyholder account balances 0.2   0.2
Other | 1-50 basis points above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 334.9   351.2
Other | 1-50 basis points above | 0.00%-2.99%      
Policyholder Account Balance [Line Items]      
Policyholder account balances 334.9   351.2
Other | 1-50 basis points above | 3.00%-4.99%      
Policyholder Account Balance [Line Items]      
Policyholder account balances 0.0   0.0
Other | 1-50 basis points above | 5.00% and greater      
Policyholder Account Balance [Line Items]      
Policyholder account balances 0.0   0.0
Other | 51-150 basis points above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 0.0   0.0
Other | 51-150 basis points above | 0.00%-2.99%      
Policyholder Account Balance [Line Items]      
Policyholder account balances 0.0   0.0
Other | 51-150 basis points above | 3.00%-4.99%      
Policyholder Account Balance [Line Items]      
Policyholder account balances 0.0   0.0
Other | 51-150 basis points above | 5.00% and greater      
Policyholder Account Balance [Line Items]      
Policyholder account balances 0.0   0.0
Other | Greater than 150 basis points above      
Policyholder Account Balance [Line Items]      
Policyholder account balances 0.0   0.0
Other | Greater than 150 basis points above | 0.00%-2.99%      
Policyholder Account Balance [Line Items]      
Policyholder account balances 0.0   0.0
Other | Greater than 150 basis points above | 3.00%-4.99%      
Policyholder Account Balance [Line Items]      
Policyholder account balances 0.0   0.0
Other | Greater than 150 basis points above | 5.00% and greater      
Policyholder Account Balance [Line Items]      
Policyholder account balances 0.0   0.0
Fixed indexed annuities      
Policyholder Account Balance [Line Items]      
Policyholder account balances 10,594.8   9,960.6
Funding agreements      
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 2,573.7   $ 1,408.2