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Other Comprehensive Income (Loss) And Accumulated Other Comprehensive Income - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Debt Securities, Unrealized Gain (Loss) [Abstract] |  |  |  |
Accumulated Other Comprehensive Income | $ 448.1 | $ 680.5 |  |
AOCI, Gain (Loss), Debt Securities, Available-for-sale, with Allowance for Credit Loss, Parent |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent | 59.7 | (78.7) | $ (85.2) |
Reclassification from AOCI, Current Period, Tax | 11.3 | 3.6 | 5.8 |
Accumulated Net Unrealized Investment Gain (Loss) |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent | 0.4 | 0.5 | 0.0 |
Reclassification from AOCI, Current Period, Tax | 0.0 | 0.0 | 0.0 |
Accumulated Defined Benefit Plans Adjustment |  |  |  |
Debt Securities, Unrealized Gain (Loss) [Abstract] |  |  |  |
Net Unrecognized Postretirement Benefit Costs, Net of Income Taxes |  |  |  | $ (94.5)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent | 2.4 | (15.3) | 1.7 |
Reclassification from AOCI, Current Period, Tax | 0.0 | (13.5) | 0.0 |
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent | (0.1) | 0.0 | (0.1) |
Reclassification from AOCI, Current Period, Tax | (0.1) | 0.0 | 0.0 |
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent | 62.4 | (93.5) | (83.6) |
Reclassification from AOCI, Current Period, Tax | $ 11.2 | $ (9.9) | $ 5.8 |

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