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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2022
Income Tax Disclosure [Abstract] |
Summary of Income Tax Assets and Liabilities | The income tax assets and liabilities included in Other assets and Other liabilities, respectively, in the Consolidated Balance Sheets were as follows:
($ in millions) |  | December 31,
|  | 2022 |  | 2021
Income tax (asset) liability |  |  |  |
Current |  | $ | (18.8) |  |  | $ | (9.5) |
Deferred |  | 6.2 |  |  | 190.5 |
Summary of Deferred Tax Assets and Liabilities | The "temporary differences" that gave rise to the deferred tax balances were as follows:
($ in millions) |  | December 31,
|  | 2022 |  | 2021
Deferred tax assets |  |  |  |
Other comprehensive income - net unrealized losses on securities |  | $ | 105.8 |  |  | $ | — |
Unearned premium reserve reduction |  | 10.1 |  |  | 11.7 |
Compensation accruals |  | 8.4 |  |  | 9.6 |
Impaired securities |  | 2.0 |  |  | 2.3 |
Other comprehensive income - net funded status of benefit plans |  | 2.3 |  |  | 2.7 |
Discounting of unpaid claims and claim expense tax reserves |  | 2.8 |  |  | 2.5 |
Net operating loss carryforward |  | 3.6 |  |  | — |
Intangibles |  | 0.1 |  |  | 0.1 |
Postretirement benefits other than pensions |  | 0.2 |  |  | 0.3 |
Total gross deferred tax assets |  | 135.3 |  |  | 29.2 |
Deferred tax liabilities |  |  |  |
Other comprehensive income - net unrealized gains on securities |  | — |  |  | 101.1 |
Deferred policy acquisition costs |  | 73.0 |  |  | 37.3 |
Life insurance future policy benefit reserve |  | 30.9 |  |  | 30.7 |
Life insurance future policy benefit reserve (transitional rule) |  | 6.4 |  |  | 8.5 |
Discounting of unpaid claims and claim expense tax reserves (transitional rule) |  | 0.5 |  |  | 0.6 |
Investment related adjustments |  | 29.9 |  |  | 37.3 |
Other, net |  | 0.8 |  |  | 4.2 |
Total gross deferred tax liabilities |  | 141.5 |  |  | 219.7 |
Net deferred tax liability |  | $ | 6.2 |  |  | $ | 190.5 |
Summary of Income Taxes Expenses | The components of the provision for income tax expense (benefit) were as follows:
($ in millions) |  | Years Ended December 31,
|  | 2022 |  | 2021 |  | 2020
Current |  | $ | (0.7) |  |  | $ | 27.7 |  |  | $ | 16.9 |
Deferred |  | (8.6) |  |  | 4.4 |  |  | 9.4 |
Total income tax expense (benefit) |  | $ | (9.3) |  |  | $ | 32.1 |  |  | $ | 26.3 |
Summary of Income Taxes Expenses Reconciliation | Income tax expense for the following periods differed from the expected tax computed by applying the federal corporate tax rate of 21% for 2022, 2021 and 2020 to income before income taxes as follows:
($ in millions) |  | Years Ended December 31,
|  | 2022 |  | 2021 |  | 2020
Expected federal tax on income |  | $ | (2.5) |  |  | $ | 36.7 |  |  | $ | 33.5 |
Add (deduct) tax effects of: |  |  |  |  |  |
Tax-exempt interest |  | (3.3) |  |  | (3.9) |  |  | (4.2) |
Dividend received deduction |  | (3.2) |  |  | (2.2) |  |  | (1.5) |
Goodwill impairment |  | — |  |  | — |  |  | 0.2 |
CARES Act net operating loss carryback |  | — |  |  | — |  |  | (2.8) |
Employee share-based compensation |  | (0.5) |  |  | (1.3) |  |  | (0.5) |
Contingent consideration |  | (0.3) |  |  | — |  |  | — |
Compensation deduction limitation |  | 0.7 |  |  | 1.5 |  |  | 0.7 |
Research and development reserve |  | (0.4) |  |  | — |  |  | 0.2 |
Prior year adjustments |  | 0.1 |  |  | 0.1 |  |  | (0.2) |
Other, net |  | 0.1 |  |  | 1.2 |  |  | 0.9 |
Income tax expense (benefit) provided on income |  | $ | (9.3) |  |  | $ | 32.1 |  |  | $ | 26.3 |
Summary of Unrecognized Tax Benefits, Excluding Interest and Penalties | A reconciliation of the beginning and ending amounts of unrecognized tax benefits, excluding interest and penalties, is as follows:
($ in millions) |  | Years Ended December 31,
|  | 2022 |  | 2021 |  | 2020
Balance as of the beginning of the year |  | $ | 1.7 |  |  | $ | 2.3 |  |  | $ | 2.0 |
Increases related to prior year tax positions |  | — |  |  | — |  |  | 0.2 |
Decreases related to prior year tax positions |  | — |  |  | (0.1) |  |  | — |
Increases related to current year tax positions |  | — |  |  | — |  |  | 0.1 |
Settlements |  | — |  |  | — |  |  | — |
Lapse of statute |  | (1.3) |  |  | (0.5) |  |  | — |
Balance as of the end of the year |  | $ | 0.4 |  |  | $ | 1.7 |  |  | $ | 2.3 |

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