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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Millions | Total | Common stock | Additional paid-in capital | Retained earnings | Accumulated other comprehensive income (loss), net of tax: | Treasury stock, at cost
--- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2022 |  | $ 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 | $ 5.5 |  |  | 5.5 |  |
Dividends, 2024, $0.34 per share; 2023, $0.33 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 |
Change in net funded status of benefit plans |  |  |  |  | 0.0 |
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 | 11.7 |  |  | 11.7 |  |
Dividends, 2024, $0.34 per share; 2023, $0.33 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 |
Change in net funded status of benefit plans |  |  |  |  | 0.0 |
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)
Beginning balance at Dec. 31, 2023 | 1,175.3 | 0.1 | 510.9 | 1,502.2 | (314.0) | (523.9)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Options exercised and conversion of common and restricted stock units |  |  | 0.5 |  |  |
Share-based compensation expense |  |  | 6.9 |  |  |
Net income | 64.6 |  |  | 64.6 |  |
Dividends, 2024, $0.34 per share; 2023, $0.33 per share |  |  |  | (42.7) |  |
Change in net unrealized investment losses on fixed maturity securities |  |  |  |  | 91.1 |
Change in net reserve remeasurements attributable to discount rates | (0.1) |  |  |  | (0.1) |
Change in net funded status of benefit plans |  |  |  |  | 0.0 |
Treasury stock acquired - share repurchase authorization |  |  |  |  |  | (8.6)
Ending balance at Sep. 30, 2024 | 1,287.0 | 0.1 | 518.3 | 1,524.1 | (223.0) | (532.5)
Beginning balance at Jun. 30, 2024 |  | 0.1 | 515.8 | 1,504.0 | (282.7) | (528.4)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Options exercised and conversion of common and restricted stock units |  |  | 0.3 |  |  |
Share-based compensation expense |  |  | 2.2 |  |  |
Net income | 34.3 |  |  | 34.3 |  |
Dividends, 2024, $0.34 per share; 2023, $0.33 per share |  |  |  | (14.2) |  |
Change in net unrealized investment losses on fixed maturity securities |  |  |  |  | 133.2 |
Change in net reserve remeasurements attributable to discount rates | (73.5) |  |  |  | (73.5) |
Change in net funded status of benefit plans |  |  |  |  | 0.0 |
Treasury stock acquired - share repurchase authorization |  |  |  |  |  | (4.1)
Ending balance at Sep. 30, 2024 | $ 1,287.0 | $ 0.1 | $ 518.3 | $ 1,524.1 | $ (223.0) | $ (532.5)

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