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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2021
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,
|  | 2021 |  | 2020
Income tax (asset) liability |  |  |  |
Current |  | $ | (9.5) |  |  | $ | (12.6) |
Deferred |  | 190.5 |  |  | 206.7 |
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,
|  | 2021 |  | 2020
Deferred tax assets |  |  |  |
Unearned premium reserve reduction |  | $ | 11.7 |  |  | $ | 11.5 |
Compensation accruals |  | 9.6 |  |  | 9.5 |
Impaired securities |  | 2.3 |  |  | 2.1 |
Other comprehensive income - net funded status of benefit plans |  | 2.7 |  |  | 3.0 |
Discounting of unpaid claims and claim expense tax reserves |  | 2.5 |  |  | 2.5 |
Intangibles |  | 0.1 |  |  | — |
Postretirement benefits other than pensions |  | 0.3 |  |  | 0.3 |
Total gross deferred tax assets |  | 29.2 |  |  | 28.9 |
Deferred tax liabilities |  |  |  |
Other comprehensive income - net unrealized gains on securities |  | 101.1 |  |  | 124.7 |
Deferred policy acquisition costs |  | 37.3 |  |  | 36.3 |
Life insurance future policy benefit reserve |  | 30.7 |  |  | 26.7 |
Life insurance future policy benefit reserve (transitional rule) |  | 8.5 |  |  | 10.7 |
Discounting of unpaid claims and claim expense tax reserves (transitional rule) |  | 0.6 |  |  | 0.8 |
Investment related adjustments |  | 37.3 |  |  | 34.2 |
Intangibles |  | — |  |  | 0.2 |
Other, net |  | 4.2 |  |  | 2.0 |
Total gross deferred tax liabilities |  | 219.7 |  |  | 235.6 |
Net deferred tax liability |  | $ | 190.5 |  |  | $ | 206.7 |
Income taxes expenses | The components of the provision for income tax expense were as follows:
($ in millions) |  | Years Ended December 31,
|  | 2021 |  | 2020 |  | 2019
Current |  | $ | 27.7 |  |  | $ | 16.9 |  |  | $ | 31.5 |
Deferred |  | 4.4 |  |  | 9.4 |  |  | 20.5 |
Total income tax expense |  | $ | 32.1 |  |  | $ | 26.3 |  |  | $ | 52.0 |
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 2021, 2020 and 2019 to income before income taxes as follows:
($ in millions) |  | Years Ended December 31,
|  | 2021 |  | 2020 |  | 2019
Expected federal tax on income |  | $ | 36.7 |  |  | $ | 33.5 |  |  | $ | 49.6 |
Add (deduct) tax effects of: |  |  |  |  |  |
Tax-exempt interest |  | (3.9) |  |  | (4.2) |  |  | (4.2) |
Dividend received deduction |  | (2.2) |  |  | (1.5) |  |  | (1.4) |
Goodwill impairment |  | — |  |  | 0.2 |  |  | 5.9 |
CARES Act net operating loss carryback |  | — |  |  | (2.8) |  |  | — |
Employee share-based compensation |  | (1.3) |  |  | (0.5) |  |  | 0.3 |
Compensation deduction limitation |  | 1.5 |  |  | 0.7 |  |  | 0.7 |
Prior year adjustments |  | 0.1 |  |  | (0.2) |  |  | (0.7) |
Other, net |  | 1.2 |  |  | 1.1 |  |  | 1.8 |
Income tax expense provided on income |  | $ | 32.1 |  |  | $ | 26.3 |  |  | $ | 52.0 |
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,
|  | 2021 |  | 2020 |  | 2019
Balance as of the beginning of the year |  | $ | 2.3 |  |  | $ | 2.0 |  |  | $ | 1.8 |
Increases related to prior year tax positions |  | — |  |  | 0.2 |  |  | 0.1 |
Decreases related to prior year tax positions |  | (0.1) |  |  | — |  |  | — |
Increases related to current year tax positions |  | — |  |  | 0.1 |  |  | 0.1 |
Settlements |  | — |  |  | — |  |  | — |
Lapse of statute |  | (0.5) |  |  | — |  |  | — |
Balance as of the end of the year |  | $ | 1.7 |  |  | $ | 2.3 |  |  | $ | 2.0 |

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