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Comprehensive Income (Loss) and Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2022
Equity [Abstract] |
Schedule of Components of Comprehensive Income | The components of comprehensive income (loss) were as follows:
($ in millions) |  | Year Ended December 31,
|  | 2022 |  | 2021 |  | 2020
Net income (loss) |  | $ | (2.6) |  |  | $ | 142.8 |  |  | $ | 133.3 |
Other comprehensive income (loss): |  |  |  |  |  |
Change in net unrealized investment gains (losses) on fixed maturity securities: |  |  |  |  |  |
Net unrealized investment gains (losses) on securities arising during the period |  | (885.3) |  |  | (104.9) |  |  | 184.0 |
Less: reclassification adjustment for net investment gains (losses) included in income before income tax |  | (61.6) |  |  | (8.5) |  |  | 11.2 |
Total, before tax |  | (823.7) |  |  | (96.4) |  |  | 172.8 |
Income tax expense (benefit) |  | (176.1) |  |  | (20.8) |  |  | 36.9 |
Total, net of tax |  | (647.6) |  |  | (75.6) |  |  | 135.9 |
Change in net funded status of benefit plans: |  |  |  |  |  |
Before tax |  | 1.8 |  |  | 1.2 |  |  | (0.5) |
Income tax expense (benefit) |  | 0.4 |  |  | 0.2 |  |  | (0.1) |
Total, net of tax |  | 1.4 |  |  | 1.0 |  |  | (0.4) |
Total comprehensive income (loss) |  | $ | (648.8) |  |  | $ | 68.2 |  |  | $ | 268.8 |
Schedule of Accumulated Other Comprehensive Income (Loss) | The following table reconciles the components of AOCI for the periods indicated.
($ in millions) |  | Net Unrealized Investment Gains (Losses) on Securities(1)(2) |  | Net Funded Status of Benefit Plans(1) |  | Total(1)
Beginning balance, January 1, 2022 |  | $ | 290.7 |  |  | $ | (10.2) |  |  | $ | 280.5 |
Other comprehensive income (loss) before reclassifications |  | (696.3) |  |  | 1.4 |  |  | (694.9) |
Amounts reclassified from AOCI |  | 48.7 |  |  | — |  |  | 48.7 |
Net current period other comprehensive income (loss) |  | (647.6) |  |  | 1.4 |  |  | (646.2) |
Ending balance, December 31, 2022 |  | $ | (356.9) |  |  | $ | (8.8) |  |  | $ | (365.7) |
Beginning balance, January 1, 2021 |  | $ | 366.3 |  |  | $ | (11.2) |  |  | $ | 355.1 |
Other comprehensive income (loss) before reclassifications |  | (82.3) |  |  | 1.0 |  |  | (81.3) |
Amounts reclassified from AOCI |  | 6.7 |  |  | — |  |  | 6.7 |
Net current period other comprehensive income (loss) |  | (75.6) |  |  | 1.0 |  |  | (74.6) |
Ending balance, December 31, 2021 |  | $ | 290.7 |  |  | $ | (10.2) |  |  | $ | 280.5 |
Beginning balance, January 1, 2020 |  | $ | 230.4 |  |  | $ | (10.8) |  |  | $ | 219.6 |
Other comprehensive income (loss) before reclassifications |  | 144.7 |  |  | (0.4) |  |  | 144.3 |
Amounts reclassified from AOCI |  | (8.8) |  |  | — |  |  | (8.8) |
Net current period other comprehensive income (loss) |  | 135.9 |  |  | (0.4) |  |  | 135.5 |
Ending balance, December 31, 2020 |  | $ | 366.3 |  |  | $ | (11.2) |  |  | $ | 355.1 |
(1) All amounts are net of tax. (2) The pretax amounts reclassified from AOCI, $(61.6) million, $(8.5) million and $11.2 million, are included in net investment gains (losses) and the related income tax expense (benefit), $(12.9) million, $(1.8) million and $2.4 million, are included in income tax expense (benefit) in the Consolidated Statements of Operations and Comprehensive Income (Loss) for the years ended December 31, 2022, 2021 and 2020, respectively.

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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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