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BUSINESS AND BASIS OF PRESENTATION - Consolidated Statement of Operations (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Sep. 30, 2024
Dec. 31, 2024
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Insurance policy benefits $ 658.4 $ 570.0 $ 731.0 $ 574.4 $ 1,228.4 $ 1,211.0 $ 1,942.0 $ 2,450.3
Change in fair value of market risk benefits (10.9)   (20.9) (5.8) 4.4 (24.7) (45.6)  
Total benefits and expenses 1,033.5 976.3 1,118.6 915.6 2,009.8 1,925.9 3,044.5 3,909.6
Income before income taxes 118.0 27.8 $ 11.0 150.6 145.8 296.8 $ 307.8 539.9
Income tax expense 26.2 6.3   34.3 32.5 68.2   119.1
Net income $ 91.8 $ 21.5   $ 116.3 $ 113.3 $ 228.6   $ 420.8
Basic earnings per common share (in dollars per share) $ 0.93 $ 0.21 $ 0.09 $ 1.08 $ 1.14 $ 2.11 $ 2.22 $ 3.96
Diluted earnings per common share (in dollars per share) $ 0.91 $ 0.21 $ 0.09 $ 1.06 $ 1.11 $ 2.08 $ 2.18 $ 3.89
As previously reported                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Insurance policy benefits   $ 580.1 $ 726.2       $ 1,926.4 $ 2,471.9
Change in fair value of market risk benefits     (16.1)       (30.0)  
Total benefits and expenses   986.4 1,118.6       3,044.5 3,931.2
Income before income taxes   17.7 $ 11.0       $ 307.8 518.3
Income tax expense   4.0           114.3
Net income   $ 13.7           $ 404.0
Basic earnings per common share (in dollars per share)   $ 0.14 $ 0.09       $ 2.22 $ 3.81
Diluted earnings per common share (in dollars per share)   $ 0.13 $ 0.09       $ 2.18 $ 3.74
Adjustments                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Insurance policy benefits   $ (10.1) $ 4.8       $ 15.6 $ (21.6)
Change in fair value of market risk benefits     (4.8)       (15.6)  
Total benefits and expenses   (10.1) 0.0       0.0 (21.6)
Income before income taxes   10.1 $ 0.0       $ 0.0 21.6
Income tax expense   2.3           4.8
Net income   $ 7.8           $ 16.8
Basic earnings per common share (in dollars per share)   $ 0.07 $ 0       $ 0 $ 0.15
Diluted earnings per common share (in dollars per share)   $ 0.08 $ 0       $ 0 $ 0.15