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Condensed Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Net Loss $ (146.3) $ (74.8) $ (323.5) $ (233.3)
Other Comprehensive Income (Loss) Before Income Taxes        
Change in Net Unrecognized Postretirement Benefit Costs 61.4 (0.2) 60.3 (0.3)
(Loss) Gain on Cash Flow Hedges 0.0 0.0 (0.1) 5.9
Change in Discount Rate on Future Life Policyholder Benefits 276.8 330.9 217.6 1,420.9
Other Comprehensive Income (Loss) Before Income Taxes 8.8 (81.6) 52.3 (218.0)
Other Comprehensive Income Tax (Expense) Benefit (1.4) 17.2 (10.8) 45.8
Other Comprehensive Income (Loss), Net of Taxes 7.4 (64.4) 41.5 (172.2)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest (139.0) (139.2) (282.1) (405.5)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest 0.0 0.0 0.0 0.0
Net Income (Loss) Attributable to Noncontrolling Interest (0.1) 0.0 (0.1) 0.0
Total Comprehensive Loss (138.9) (139.2) (282.0) (405.5)
No Credit Losses Recognized in Condensed Consolidated Statements of Loss        
Other Comprehensive Income (Loss) Before Income Taxes        
Changes in Net Unrealized Holding Losses on Investment Securities with: (327.9) (411.5) (223.9) (1,643.2)
Credit Losses Recognized in Condensed Consolidated Statements of Loss        
Other Comprehensive Income (Loss) Before Income Taxes        
Changes in Net Unrealized Holding Losses on Investment Securities with: $ (1.5) $ (0.8) $ (1.6) $ (1.3)