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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
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
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 |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Standards Update [Extensible List] | Accounting Standards Update 2018-12 |  |  |  |  |  |  |  |  |  |  |  |
Options exercised and conversion of common and restricted stock units |  |  |  |  | (1.1) |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  | 6.2 |  |  |  |  |  |  |  |
Net income (loss) | $ 36.5 | $ 20.6 |  |  |  |  | 36.5 | 20.6 |  |  |  |  |
Dividends, 2023, $0.33 per share; 2022, $0.32 per share |  |  |  |  |  |  | (40.3) | 0.1 |  |  |  |  |
Change in net unrealized investment losses on fixed maturity securities |  |  |  |  |  |  |  |  |  | (843.9) | (156.5) |  |
Change in net reserve remeasurements attributable to discount rates | 460.7 | 460.7 |  |  |  |  |  |  |  | 460.7 | 460.7 |  |
Treasury stock acquired - share repurchase authorization |  |  |  |  |  |  |  |  |  |  |  | (24.0) |
Ending balance at Sep. 30, 2022 | 1,092.3 | 15.7 | 0.1 | $ 0.0 | 500.4 | $ 0.0 | 1,542.4 | 42.0 |  | (433.2) | (26.3) | (517.4) | $ 0.0
Beginning balance at Jun. 30, 2022 |  |  | 0.1 |  | 498.1 |  | 1,535.3 | 35.4 |  | (328.9) | (98.3) | (507.4) |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |
Options exercised and conversion of common and restricted stock units |  |  |  |  | 0.2 |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  | 2.1 |  |  |  |  |  |  |  |
Net income (loss) | 20.4 | 6.5 |  |  |  |  | 20.4 | 6.5 |  |  |  |  |
Dividends, 2023, $0.33 per share; 2022, $0.32 per share |  |  |  |  |  |  | (13.3) | 0.1 |  |  |  |  |
Change in net unrealized investment losses on fixed maturity securities |  |  |  |  |  |  |  |  |  | (215.0) | (38.7) |  |
Change in net reserve remeasurements attributable to discount rates | 110.7 | 110.7 |  |  |  |  |  |  |  | 110.7 | 110.7 |  |
Treasury stock acquired - share repurchase authorization |  |  |  |  |  |  |  |  |  |  |  | (10.0) |
Ending balance at Sep. 30, 2022 | 1,092.3 | 15.7 | 0.1 | $ 0.0 | 500.4 | $ 0.0 | 1,542.4 | $ 42.0 |  | (433.2) | $ (26.3) | (517.4) | $ 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 |  |  |  |  | (0.8) |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  | 6.7 |  |  |  |  |  |  |  |
Net income (loss) | 5.5 |  |  |  |  |  | 5.5 |  |  |  |  |  |
Dividends, 2023, $0.33 per share; 2022, $0.32 per share |  |  |  |  |  |  | (41.4) |  |  |  |  |  |
Change in net unrealized investment losses on fixed maturity securities |  |  |  |  |  |  |  |  |  | (85.1) |  |  |
Change in net reserve remeasurements attributable to discount rates | 74.6 |  |  |  |  |  |  |  |  | 74.6 |  |  |
Treasury stock acquired - share repurchase authorization |  |  |  |  |  |  |  |  |  |  |  | (6.5) |
Ending balance at Sep. 30, 2023 | 1,051.3 |  | 0.1 |  | 508.5 |  | 1,476.5 |  |  | (409.9) |  | (523.9) |
Beginning balance at Jun. 30, 2023 |  |  | 0.1 |  | 505.7 |  | 1,478.6 |  |  | (359.6) |  | (522.9) |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |
Options exercised and conversion of common and restricted stock units |  |  |  |  | 0.3 |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  | 2.5 |  |  |  |  |  |  |  |
Net income (loss) | 11.7 |  |  |  |  |  | 11.7 |  |  |  |  |  |
Dividends, 2023, $0.33 per share; 2022, $0.32 per share |  |  |  |  |  |  | (13.8) |  |  |  |  |  |
Change in net unrealized investment losses on fixed maturity securities |  |  |  |  |  |  |  |  |  | (141.0) |  |  |
Change in net reserve remeasurements attributable to discount rates | 90.7 |  |  |  |  |  |  |  |  | 90.7 |  |  |
Treasury stock acquired - share repurchase authorization |  |  |  |  |  |  |  |  |  |  |  | (1.0) |
Ending balance at Sep. 30, 2023 | $ 1,051.3 |  | $ 0.1 |  | $ 508.5 |  | $ 1,476.5 |  |  | $ (409.9) |  | $ (523.9) |
[1] | See Note 1 to the Consolidated Financial Statements for information regarding the adoption of ASU 2018-12.

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