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Deferred Acquisition Costs and Other Actuarial Balances - Benefits and Protection - Balances and changes in DAC (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Deferred Acquisition Costs |  |  |
Beginning balance, Deferred acquisition costs | $ 3,948.0 |  | $ 3,822.3
Amortized to expense | (389.8) | $ (386.9) | (373.4)
Ending balance, Deferred acquisition costs | 3,950.5 | 3,948.0 |
Benefits and Protection |  |  |
Deferred Acquisition Costs |  |  |
Beginning balance, Deferred acquisition costs | 3,009.2 |  | 2,857.9
Amortized to expense | (292.9) | (284.8) | (265.1)
Ending balance, Deferred acquisition costs | 3,023.9 | 3,009.2 |
Individual disability | Benefits and Protection | Specialty Benefits |  |  |
Deferred Acquisition Costs |  |  |
Beginning balance, Deferred acquisition costs | 626.1 | 580.7 | 529.8
Costs deferred | 86.7 | 87.6 | 89.8
Amortized to expense | (45.1) | (42.2) | (38.9)
Ending balance, Deferred acquisition costs | 667.7 | 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 | 70.7 | 70.6 | 84.3
Amortized to expense | (95.1) | (97.1) | (96.4)
Ending balance, Deferred acquisition costs | 1,545.3 | 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 | 71.3 | 66.7 | 126.5
Amortized to expense | (61.9) | (59.9) | (55.5)
Ending balance, Deferred acquisition costs | 695.1 | 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 | 1.4 | 1.4 | 1.9
Amortized to expense | (9.7) | (10.7) | (11.5)
Ending balance, Deferred acquisition costs | $ 84.7 | $ 93.0 | $ 102.3

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