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Other Comprehensive Income and Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
Stockholders' Equity Attributable to Parent | $ 2,671.2 |  | $ 2,671.2 |  |  | $ 2,505.2 |  |
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax |  |  |  |  |  | 9.5 |  | $ (37.2)
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax |  |  |  |  | $ 2.5 | 2.5 |  | 2.8
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax | 160.6 | $ 241.1 | 160.6 | $ 241.1 | 272.1 |  | $ 154.4 |
AOCI, Gain (Loss), Debt Securities, Available-for-sale, with Allowance for Credit Loss, Parent |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent | (679.6) | (637.6) | (679.6) | (637.6) | (617.2) | (530.9) | (572.0) | (719.4)
OCI, before Reclassifications, Net of Tax, Attributable to Parent | (61.4) | (72.1) | (157.5) | 75.4 |  |  |  |
Reclassification from AOCI, Current Period, Tax | 0.3 | (1.8) | (2.3) | (1.8) |  |  |  |
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | (1.0) | 6.5 | 8.8 | 6.4 |  |  |  |
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent | 16.8 | 19.4 | 39.5 | (20.4) |  |  |  |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | (62.4) | (65.6) | (148.7) | 81.8 |  |  |  |
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent | (3.7) | (2.3) | (3.7) | (2.3) | (1.1) | (2.5) | (2.2) | (2.2)
OCI, before Reclassifications, Net of Tax, Attributable to Parent | (2.3) | 0.0 | (0.7) | 1.4 |  |  |  |
Reclassification from AOCI, Current Period, Tax | 0.0 | 0.0 | 0.2 | 0.4 |  |  |  |
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | (0.3) | (0.1) | (0.5) | (1.5) |  |  |  |
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent | 0.4 | 0.0 | 0.5 | (0.4) |  |  |  |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | (2.6) | (0.1) | (1.2) | (0.1) |  |  |  |
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent | 8.3 | (38.0) | 8.3 | (38.0) |  |  | 37.6 |
OCI, before Reclassifications, Net of Tax, Attributable to Parent | 0.0 | 0.0 | 0.0 | 0.0 |  |  |  |
Reclassification from AOCI, Current Period, Tax | 0.4 | 0.4 | 0.5 | 0.3 |  |  |  |
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | (0.4) | (0.4) | (1.2) | (0.8) |  |  |  |
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent | 0.4 | 0.0 | 0.5 | 0.0 |  |  |  |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | (0.4) | (0.4) | (1.2) | (0.8) |  |  |  |
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax |  |  |  |  | 8.7 |  |  |
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent | (0.3) | 2.7 | (0.3) | 2.7 |  |  | 2.7 |
OCI, before Reclassifications, Net of Tax, Attributable to Parent | (2.8) | 0.0 | (2.8) | 0.0 |  |  |  |
Reclassification from AOCI, Current Period, Tax | 0.0 | (0.1) | 0.0 | 0.0 |  |  |  |
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | 0.0 | 0.0 | 0.0 | (0.1) |  |  |  |
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent | 0.8 | 0.0 | 0.8 | 0.0 |  |  |  |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | (2.8) | 0.0 | (2.8) | (0.1) |  |  |  |
AOCI, Liability for Future Policy Benefit, Parent |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent | 358.0 | 194.4 | 358.0 | 194.4 |  |  |  |
OCI, before Reclassifications, Net of Tax, Attributable to Parent | 85.9 | 40.0 | 197.4 | (46.7) |  |  |  |
Reclassification from AOCI, Current Period, Tax | 0.0 | 0.0 | 0.0 | 0.0 |  |  |  |
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | 0.0 | 0.0 | 0.0 | 0.0 |  |  |  |
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent | (22.9) | (10.6) | (52.5) | 12.5 |  |  |  |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | 85.9 | 40.0 | 197.4 | (46.7) |  |  |  |
AOCI Attributable to Parent [Member] |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent | (317.3) | (480.8) | (317.3) | (480.8) | $ (335.0) | $ (360.8) | $ (454.7) | $ (514.9)
OCI, before Reclassifications, Net of Tax, Attributable to Parent | 19.4 | (32.1) | 36.4 | 30.1 |  |  |  |
Reclassification from AOCI, Current Period, Tax | 0.7 | (1.5) | (1.6) | (1.1) |  |  |  |
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | (1.7) | 6.0 | 7.1 | 4.0 |  |  |  |
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent | (4.5) | 8.8 | (11.2) | (8.3) |  |  |  |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | $ 17.7 | $ (26.1) | $ 43.5 | $ 34.1 |  |  |  |

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