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Other Comprehensive (Loss) Income And Accumulated Other Comprehensive Income - Other Comprehensive (Loss) Income (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Stockholders' Equity Attributable to Parent | $ 2,788.4 | $ 2,505.2 |  | $ (849.7)
Net Unrealized Losses on Fixed Maturities |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Stockholders' Equity Attributable to Parent | (687.8) | (530.9) | $ (719.4) | 505.8
OCI, before Reclassifications, Net of Tax, Attributable to Parent | (165.8) | 185.0 | (1,215.1) |
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | 8.9 | 3.5 | (10.1) |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | (156.9) | 188.5 | (1,225.2) |
Net Unrealized Losses on Investments with an Allowance for Credit Losses |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Stockholders' Equity Attributable to Parent | (3.2) | (2.5) | (2.2) | (3.7)
OCI, before Reclassifications, Net of Tax, Attributable to Parent | (0.3) | (0.3) | 2.0 |
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | (0.4) | 0.0 | (0.5) |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | (0.7) | (0.3) | 1.5 |
Net Unrecognized Postretirement Benefit Income (Costs) |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Stockholders' Equity Attributable to Parent | 8.4 | 9.5 | (37.2) | 52.1
OCI, before Reclassifications, Net of Tax, Attributable to Parent | 1.4 | (6.0) | 15.2 |
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | (2.5) | 52.7 | (0.3) |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | (1.1) | 46.7 | 14.9 |
(Loss) Gain on Cash Flow Hedges |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Stockholders' Equity Attributable to Parent | (2.2) | 2.5 | 2.8 | (1.9)
OCI, before Reclassifications, Net of Tax, Attributable to Parent | (5.4) | 0.0 | 4.7 |
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | 0.7 | (0.3) | 0.0 |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | (4.7) | (0.3) | 4.7 |
Change in Discount Rate on Future Life Policyholder Benefits |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Stockholders' Equity Attributable to Parent | 380.3 | 160.6 | 241.1 |
OCI, before Reclassifications, Net of Tax, Attributable to Parent | 219.7 | (80.5) | 1,090.8 |
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | 0.0 | 0.0 |  |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | 219.7 | (80.5) | 1,090.8 |
Accumulated Other Comprehensive Loss |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Stockholders' Equity Attributable to Parent | (304.5) | (360.8) | (514.9) | $ (401.6)
OCI, before Reclassifications, Net of Tax, Attributable to Parent | 49.6 | 98.2 | (102.4) |
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | 6.7 | 55.9 | (10.9) |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | $ 56.3 | $ 154.1 | $ (113.3) |

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