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Deferred Acquisition Costs and Other Actuarial Balances - Retirement and Income Solutions - Balances and changes in DAC (Details) - USD ($) $ in Millions | 12 Months Ended
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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 |
Retirement and Income Solutions |  |  |
Deferred Acquisition Costs |  |  |
Beginning balance, Deferred acquisition costs | 930.0 |  | 964.4
Amortized to expense | (95.8) | (101.0) | (107.1)
Ending balance, Deferred acquisition costs | 918.9 | 930.0 |
Workplace savings and retirement solutions | Retirement and Income Solutions |  |  |
Deferred Acquisition Costs |  |  |
Beginning balance, Deferred acquisition costs | 498.0 | 489.0 | 477.2
Costs deferred | 48.1 | 48.3 | 50.1
Amortized to expense | (39.7) | (39.3) | (38.3)
Ending balance, Deferred acquisition costs | 506.4 | 498.0 | 489.0
Individual variable annuities | Retirement and Income Solutions |  |  |
Deferred Acquisition Costs |  |  |
Beginning balance, Deferred acquisition costs | 278.0 | 281.2 | 281.9
Costs deferred | 27.4 | 22.5 | 26.4
Amortized to expense | (25.9) | (25.7) | (27.1)
Ending balance, Deferred acquisition costs | 279.5 | 278.0 | 281.2
Pension risk transfer | Retirement and Income Solutions |  |  |
Deferred Acquisition Costs |  |  |
Beginning balance, Deferred acquisition costs | 8.1 | 2.7 |
Costs deferred | 7.9 | 5.6 | 2.7
Amortized to expense | (0.6) | (0.2) |
Ending balance, Deferred acquisition costs | 15.4 | 8.1 | 2.7
Individual fixed deferred annuities | Retirement and Income Solutions |  |  |
Deferred Acquisition Costs |  |  |
Beginning balance, Deferred acquisition costs | 131.0 | 162.2 | 192.7
Costs deferred |  |  | 7.6
Amortized to expense | (24.9) | (31.2) | (38.1)
Ending balance, Deferred acquisition costs | 106.1 | 131.0 | 162.2
Investment only | Retirement and Income Solutions |  |  |
Deferred Acquisition Costs |  |  |
Beginning balance, Deferred acquisition costs | 14.9 | 18.1 | 12.6
Costs deferred | 1.3 | 1.4 | 9.1
Amortized to expense | (4.7) | (4.6) | (3.6)
Ending balance, Deferred acquisition costs | $ 11.5 | $ 14.9 | $ 18.1

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