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Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income (Tables) | 3 Months Ended | 9 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Statement of Comprehensive Income [Abstract] |  |  |  |
Schedule of Comprehensive Income | The tables below display the changes in Accumulated Other Comprehensive Income (Loss) by component for the three months ended September 30, 2022 and 2021.
(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 June 30, 2022 |  | (467.3) |  |  | (4.1) |  |  | (52.2) |  |  | 2.8 |  |  | (520.8) |
Other Comprehensive Income (Loss) Before Reclassifications |  | (309.0) |  |  | (0.6) |  |  | — |  |  | — |  |  | (309.6) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) Net of Tax (Expense) Benefit of $4.3, $—, $—, $— and $4.3 |  | (16.1) |  |  | — |  |  | (0.1) |  |  | — |  |  | (16.2) |
Other Comprehensive Income (Loss) Net of Tax (Expense) Benefit of $86.4, $0.2, $0.1, $— and $86.7 |  | (325.1) |  |  | (0.6) |  |  | (0.1) |  |  | — |  |  | (325.8) |
Balance as of September 30, 2022 |  | (792.4) |  |  | (4.7) |  |  | (52.3) |  |  | 2.8 |  |  | (846.6) |
| Note 11 - Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income (Loss) (Continued)
(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 June 30, 2021 |  | 594.0 |  |  | (4.0) |  |  | (44.9) |  |  | (2.1) |  |  | 543.0 |
Other Comprehensive Income (Loss) Before Reclassifications |  | (56.5) |  |  | 0.4 |  |  | — |  |  | — |  |  | (56.1) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) Net of Tax (Expense) Benefit of $2.0, $—,$0.1, $(0.1) and $2.0 |  | (7.5) |  |  | — |  |  | (0.1) |  |  | 0.1 |  |  | (7.5) |
Other Comprehensive Income (Loss) Net of Tax (Expense) Benefit of $16.8, $(0.1), $0.1, $(0.1) and $16.7 |  | (64.0) |  |  | 0.4 |  |  | (0.1) |  |  | 0.1 |  |  | (63.6) |
Balance as of September 30, 2021 |  | 530.0 |  |  | (3.6) |  |  | (45.0) |  |  | (2.0) |  |  | 479.4 |
| The tables below display the changes in Accumulated Other Comprehensive Income (Loss) by component for the nine months ended September 30, 2022 and 2021.
(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, 2022 |  | 505.8 |  |  | (3.7) |  |  | (52.1) |  |  | (1.9) |  |  | 448.1 |
Other Comprehensive Income (Loss) Before Reclassifications |  | (1,281.0) |  |  | (1.0) |  |  | — |  |  | 4.7 |  |  | (1,277.3) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) Net of Tax (Expense) Benefit of $4.5, $—, $—, $— and $4.5 |  | (17.2) |  |  | — |  |  | (0.2) |  |  | — |  |  | (17.4) |
Other Comprehensive Income (Loss) Net of Tax (Expense) Benefit of $345.0, $0.3, $0.1, $(1.2) and $344.2 |  | (1,298.2) |  |  | (1.0) |  |  | (0.2) |  |  | 4.7 |  |  | (1,294.7) |
Balance as of September 30, 2022 |  | (792.4) |  |  | (4.7) |  |  | (52.3) |  |  | 2.8 |  |  | (846.6) |
(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, 2021 |  | 730.6 |  |  | (2.1) |  |  | (45.7) |  |  | (2.3) |  |  | 680.5 |
Other Comprehensive Income (Loss) Before Reclassifications |  | (172.8) |  |  | (1.5) |  |  | — |  |  | — |  |  | (174.3) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) Net of Tax (Expense) Benefit of $7.4, $—, $0.5, $(0.1) and $7.8 |  | (27.8) |  |  | — |  |  | 0.7 |  |  | 0.3 |  |  | (26.8) |
Other Comprehensive Income (Loss) Net of Tax (Expense) Benefit of $53.4, $0.4, $0.5, $(0.1) and $54.2 |  | (200.6) |  |  | (1.5) |  |  | 0.7 |  |  | 0.3 |  |  | (201.1) |
Balance as of September 30, 2021 |  | 530.0 |  |  | (3.6) |  |  | (45.0) |  |  | (2.0) |  |  | 479.4 |

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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 https://asc.fasb.org/extlink&oid=126968391&loc=d3e526-108580 + Details
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- References No definition available. + Details
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