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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Millions | Total | Effect of the Adoption of ASU 2018-12 | Common stock, $0.001 par value | Common stock, $0.001 par value Effect of the Adoption of ASU 2018-12 | Additional paid-in capital | Additional paid-in capital Effect of the Adoption of ASU 2018-12 | Retained earnings | Retained earnings Effect of the Adoption of ASU 2018-12 | Accumulated other comprehensive income (loss), net of tax: | Accumulated other comprehensive income (loss), net of tax: Effect of the Adoption of ASU 2018-12 | Treasury stock, at cost | Treasury stock, at cost Effect of the Adoption of ASU 2018-12
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Accounting Standards Update [Extensible List] | Accounting Standards Update 2018-12 |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2021 |  |  | $ 0.1 |  | $ 495.3 |  | $ 1,547.0 | $ 22.1 |  | $ (50.0) | $ (330.5) | $ (493.4) |
Ending balance (Accounting Standards Update 2018-12) at Dec. 31, 2021 |  |  |  |  |  |  | (0.8) | (0.8) | [1] |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |
Options exercised and conversion of common and restricted stock units |  |  |  |  | (1.2) |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  | 4.0 |  |  |  |  |  |  |  |
Net income (loss) | $ 16.1 | $ 14.1 |  |  |  |  | 16.1 | 14.1 |  |  |  |  |
Dividends, 2023, $0.33 per share; 2022, $0.32 per share |  |  |  |  |  |  | (27.0) | 0.0 |  |  |  |  |
Change in net unrealized investment losses on fixed maturity securities |  |  |  |  |  |  |  |  |  | (628.9) | (117.8) |  |
Change in net reserve remeasurements attributable to discount rates | 350.0 | 350.0 |  |  |  |  |  |  |  | 350.0 | 350.0 |  |
Treasury stock acquired - share repurchase authorization |  |  |  |  |  |  |  |  |  |  |  | (14.0) |
Ending balance at Jun. 30, 2022 | 1,197.2 | (62.9) | 0.1 | $ 0.0 | 498.1 | $ 0.0 | 1,535.3 | 35.4 |  | (328.9) | (98.3) | (507.4) | $ 0.0
Beginning balance at Mar. 31, 2022 |  |  | 0.1 |  | 496.6 |  | 1,553.0 | 27.1 |  | (202.6) | (212.4) | (495.6) |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |
Options exercised and conversion of common and restricted stock units |  |  |  |  | (0.7) |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  | 2.2 |  |  |  |  |  |  |  |
Net income (loss) | (4.2) | 8.3 |  |  |  |  | (4.2) | 8.3 |  |  |  |  |
Dividends, 2023, $0.33 per share; 2022, $0.32 per share |  |  |  |  |  |  | (13.5) | 0.0 |  |  |  |  |
Change in net unrealized investment losses on fixed maturity securities |  |  |  |  |  |  |  |  |  | (294.8) | (54.4) |  |
Change in net reserve remeasurements attributable to discount rates | 168.5 | 168.5 |  |  |  |  |  |  |  | 168.5 | 168.5 |  |
Treasury stock acquired - share repurchase authorization |  |  |  |  |  |  |  |  |  |  |  | (11.8) |
Ending balance at Jun. 30, 2022 | 1,197.2 | (62.9) | 0.1 | $ 0.0 | 498.1 | $ 0.0 | 1,535.3 | $ 35.4 |  | (328.9) | $ (98.3) | (507.4) | $ 0.0
Beginning balance at Dec. 31, 2022 | 1,098.3 | $ 10.1 | 0.1 |  | 502.6 |  | 1,512.4 |  |  | (399.4) |  | (517.4) |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |
Options exercised and conversion of common and restricted stock units |  |  |  |  | (1.1) |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  | 4.2 |  |  |  |  |  |  |  |
Net income (loss) | (6.2) |  |  |  |  |  | (6.2) |  |  |  |  |  |
Dividends, 2023, $0.33 per share; 2022, $0.32 per share |  |  |  |  |  |  | (27.6) |  |  |  |  |  |
Change in net unrealized investment losses on fixed maturity securities |  |  |  |  |  |  |  |  |  | 55.9 |  |  |
Change in net reserve remeasurements attributable to discount rates | (16.1) |  |  |  |  |  |  |  |  | (16.1) |  |  |
Treasury stock acquired - share repurchase authorization |  |  |  |  |  |  |  |  |  |  |  | (5.5) |
Ending balance at Jun. 30, 2023 | 1,101.9 |  | 0.1 |  | 505.7 |  | 1,478.6 |  |  | (359.6) |  | (522.9) |
Beginning balance at Mar. 31, 2023 |  |  | 0.1 |  | 503.1 |  | 1,505.2 |  |  | (347.4) |  | (521.8) |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |
Options exercised and conversion of common and restricted stock units |  |  |  |  | 0.3 |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  | 2.3 |  |  |  |  |  |  |  |
Net income (loss) | (12.8) |  |  |  |  |  | (12.8) |  |  |  |  |  |
Dividends, 2023, $0.33 per share; 2022, $0.32 per share |  |  |  |  |  |  | (13.8) |  |  |  |  |  |
Change in net unrealized investment losses on fixed maturity securities |  |  |  |  |  |  |  |  |  | (37.3) |  |  |
Change in net reserve remeasurements attributable to discount rates | 25.1 |  |  |  |  |  |  |  |  | 25.1 |  |  |
Treasury stock acquired - share repurchase authorization |  |  |  |  |  |  |  |  |  |  |  | (1.1) |
Ending balance at Jun. 30, 2023 | $ 1,101.9 |  | $ 0.1 |  | $ 505.7 |  | $ 1,478.6 |  |  | $ (359.6) |  | $ (522.9) |
[1] | See Note 1 to the Consolidated Financial Statements for information regarding the adoption of ASU 2018-12.

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