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Other Comprehensive Income (Loss) And Accumulated Other Comprehensive Income - Other Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Other Comprehensive Income (Loss) |  |  |  |
Decrease (Increase) in Net Unrecognized Postretirement Benefit Costs | $ (8.8) | $ 70.2 | $ (7.8) |
Other Comprehensive Income (Loss) Before Income Taxes | (294.8) | 437.9 | 397.9 |
Other Comprehensive Income (Loss) before Income Taxes |  |  |  |
Unrealized Holding Gains and Losses | (60.1) | (78.3) | (85.2) |
Tax Effects from Postretirement Benefit Plans | (2.4) | (15.3) | 1.7 |
Other Comprehensive Income Tax Benefit (Expense) | 62.4 | (93.5) | (83.6) |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Stockholders' Equity Attributable to Parent | 4,007.7 | 4,563.4 |  |
Accumulated Net Unrealized Investment Gain (Loss) |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Stockholders' Equity Attributable to Parent | (3.7) | (2.1) | 0.0 | $ 0.0
OCI, before Reclassifications, Net of Tax, Attributable to Parent | (1.6) | (2.1) | 0.0 |
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | 0.0 | 0.0 | 0.0 |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | (1.6) | (2.1) | 0.0 |
Accumulated Defined Benefit Plans Adjustment |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Stockholders' Equity Attributable to Parent | (52.1) | (45.7) | (100.6) |
OCI, before Reclassifications, Net of Tax, Attributable to Parent | (6.5) | 4.3 | (6.1) |
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | 0.1 | 50.6 | 0.0 |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | (6.4) | 54.9 | (6.1) |
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Stockholders' Equity Attributable to Parent | (1.9) | (2.3) | (2.7) |
OCI, before Reclassifications, Net of Tax, Attributable to Parent | 0.0 | 0.4 | 0.3 |
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | 0.4 | 0.0 | 0.0 |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | 0.4 | 0.4 | 0.3 |
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Stockholders' Equity Attributable to Parent | 448.1 | 680.5 | 336.1 | $ 21.8
OCI, before Reclassifications, Net of Tax, Attributable to Parent | (190.1) | 307.0 | 336.6 |
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | (42.3) | 37.4 | (22.3) |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | $ (232.4) | $ 344.4 | $ 314.3 |

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