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Deferred Acquisition Costs and Other Actuarial Balances - Benefits and Protection - Balances and changes in DAC (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Dec. 31, 2021
Deferred Acquisition Costs      
Beginning balance, Deferred acquisition costs $ 3,948.0   $ 3,822.3
Ending balance, Deferred acquisition costs 3,949.9 $ 3,948.0  
Benefits and Protection      
Deferred Acquisition Costs      
Beginning balance, Deferred acquisition costs 2,974.5   2,857.9
Ending balance, Deferred acquisition costs 2,981.5 2,974.5  
Individual disability | Benefits and Protection | Specialty Benefits      
Deferred Acquisition Costs      
Beginning balance, Deferred acquisition costs 626.1 580.7 529.8
Costs deferred 42.3 87.6 89.8
Amortized to expense (22.2) (42.2) (38.9)
Ending balance, Deferred acquisition costs 646.2 626.1 580.7
Universal life | Benefits and Protection | Life Insurance      
Deferred Acquisition Costs      
Beginning balance, Deferred acquisition costs 1,569.7 1,596.2 1,608.3
Costs deferred 35.7 70.6 84.3
Amortized to expense (48.4) (97.1) (96.4)
Ending balance, Deferred acquisition costs 1,557.0 1,569.7 1,596.2
Term life | Benefits and Protection | Life Insurance      
Deferred Acquisition Costs      
Beginning balance, Deferred acquisition costs 685.7 678.9 607.9
Costs deferred 34.4 66.7 126.5
Amortized to expense (30.6) (59.9) (55.5)
Ending balance, Deferred acquisition costs 689.5 685.7 678.9
Participating life | Benefits and Protection | Life Insurance      
Deferred Acquisition Costs      
Beginning balance, Deferred acquisition costs 93.0 102.3 111.9
Costs deferred 0.7 1.4 1.9
Amortized to expense (4.9) (10.7) (11.5)
Ending balance, Deferred acquisition costs $ 88.8 $ 93.0 $ 102.3