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Other Comprehensive Income (Loss) And Accumulated Other Comprehensive Income - Reclassification from AOCI to Consolidated Statements of Income (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Income Tax Expense (Benefit) | $ 124.8 | $ (100.2) | $ (130.5) |
Net Income (Loss) | (120.5) | 409.9 | 531.1 |
Stockholders' Equity Attributable to Parent | 4,007.7 | 4,563.4 |  |
AOCI, Gain (Loss), Debt Securities, Available-for-sale, with Allowance for Credit Loss, Parent |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Stockholders' Equity Attributable to Parent | 505.8 | 730.6 | 439.4 | $ 119.3
OCI, before Reclassifications, Net of Tax, Attributable to Parent | (182.0) | 304.4 | 342.4 |
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | (42.8) | (13.2) | (22.3) |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | (224.8) | 291.2 | 320.1 |
Reclassification from AOCI, Current Period, Tax | 11.3 | 3.6 | 5.8 |
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent | 59.7 | (78.7) | (85.2) |
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 |
Reclassification from AOCI, Current Period, Tax | 0.0 | 0.0 | 0.0 |
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent | 0.4 | 0.5 | 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) |
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax |  |  |  | (94.5)
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) |
Reclassification from AOCI, Current Period, Tax | 0.0 | (13.5) | 0.0 |
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent | 2.4 | (15.3) | 1.7 |
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 |
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax |  |  |  | (3.0)
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 |
Reclassification from AOCI, Current Period, Tax | (0.1) | 0.0 | 0.0 |
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent | (0.1) | 0.0 | (0.1) |
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 |
Reclassification from AOCI, Current Period, Tax | 11.2 | (9.9) | 5.8 |
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent | $ 62.4 | $ (93.5) | $ (83.6) |

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