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Other Comprehensive Income (Loss) And Accumulated Other Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2021
Equity [Abstract] |
Schedule of Comprehensive Income (Loss) | The tables below display the changes in Accumulated Other Comprehensive Income (Loss) by component for the years ended December 31, 2021, 2020 and 2019 were:
(Dollars in Millions) |  | Net Unrealized Gains (Losses) on Other Investments |  | Net Unrealized Gains (Losses) on Investments with an Allowance for Credit Losses |  | Net Unrecognized Postretirement Benefit Costs |  | Gain (Loss) on Cash Flow Hedges |  | Total
Balance as of January 1, 2019 |  | $ | 119.3 |  |  | $ | — |  |  | $ | (94.5) |  |  | $ | (3.0) |  |  | $ | 21.8 |
Other Comprehensive Income (Loss) Before Reclassifications |  | 342.4 |  |  | — |  |  | (6.1) |  |  | 0.3 |  |  | 336.6 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) Net of Tax (Expense) Benefit of $5.8, $—, $—, $— and $5.8 |  | (22.3) |  |  | — |  |  | — |  |  | — |  |  | (22.3) |
Other Comprehensive Income (Loss) Net of Tax (Expense) Benefit of $(85.2), $—, $1.7, $(0.1) and $(83.6) |  | 320.1 |  |  | — |  |  | (6.1) |  |  | 0.3 |  |  | 314.3 |
Balance as of December 31, 2019 |  | $ | 439.4 |  |  | $ | — |  |  | $ | (100.6) |  |  | $ | (2.7) |  |  | $ | 336.1 |
Other Comprehensive Income (Loss) Before Reclassifications |  | 304.4 |  |  | (2.1) |  |  | 4.3 |  |  | 0.4 |  |  | 307.0 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) Net of Tax (Expense) Benefit of $3.6, $—, $(13.5), $— and $(9.9) |  | (13.2) |  |  | — |  |  | 50.6 |  |  | — |  |  | 37.4 |
Other Comprehensive Income (Loss) Net of Tax (Expense) Benefit of $(78.7), $0.5, $(15.3), $— and $(93.5) |  | 291.2 |  |  | (2.1) |  |  | 54.9 |  |  | 0.4 |  |  | 344.4 |
Balance as of December 31, 2020 |  | $ | 730.6 |  |  | $ | (2.1) |  |  | $ | (45.7) |  |  | $ | (2.3) |  |  | $ | 680.5 |
Other Comprehensive Income (Loss) Before Reclassifications |  | (182.0) |  |  | (1.6) |  |  | (6.5) |  |  | — |  |  | (190.1) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) Net of Tax (Expense) Benefit of $11.3, $—, $—, $(0.1) and $11.2 |  | (42.8) |  |  | — |  |  | 0.1 |  |  | 0.4 |  |  | (42.3) |
Other Comprehensive Income (Loss) Net of Tax (Expense) Benefit of $59.7, $0.4, $2.4, $(0.1) and $62.4 |  | (224.8) |  |  | (1.6) |  |  | (6.4) |  |  | 0.4 |  |  | (232.4) |
Balance as of December 31, 2021 |  | $ | 505.8 |  |  | $ | (3.7) |  |  | $ | (52.1) |  |  | $ | (1.9) |  |  | $ | 448.1 |

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- Definition Tabular disclosure of components of comprehensive income (loss). Includes, but is not limited to, foreign currency translation adjustments, foreign currency transactions designated as economic hedges of a net investment in foreign entity, gain (loss) and prior service cost (credit) for pension plans and other postretirement benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e526-108580 + Details
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