| Fiscal period | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|
| Period End Date | 12/31/2024 | 12/31/2023 | 12/31/2022 | 12/31/2021 | 12/31/2020 | 12/31/2019 | 12/31/2018 | 12/31/2017 | 12/31/2016 | 12/31/2015 |
|---|
| Net premiums written | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Net increase in unearned premiums and prepaid reinsurance premiums | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Net premiums earned | 4,376.45 | 3,827.61 | 3,373.38 | 3,017.25 | 2,681.81 | 2,597.17 | 2,436.23 | 2,291.03 | 2,149.57 | 1,989.91 |
| Net realized gains | -- | -- | -- | -- | (4.22) | 26.72 | (18.98) | 11.20 | 3.56 | 31.54 |
| Unrealized losses on equity securities | (2.95) | (3.55) | (114.81) | 17.60 | -- | (8.65) | (29.37) | -- | -- | -- |
| Net investment income earned | 457.05 | 388.65 | 288.16 | 326.59 | 227.11 | 222.54 | 195.34 | 161.88 | 130.75 | 121.32 |
| Other income (loss) | 31.12 | 19.40 | 11.34 | 17.72 | 17.57 | 12.36 | 9.44 | 10.72 | 8.88 | 7.46 |
| Diversified Insurance Services revenue | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Other-than-temporary impairments | -- | -- | -- | -- | -- | (3.64) | (6.58) | (4.81) | (8.51) | (18.37) |
| Other-than-temporary impairments on fixed maturity securities recognized in other comprehensive income | -- | -- | -- | -- | -- | -- | -- | (0.04) | 0.01 | -- |
| Total Revenues | 4,861.66 | 4,232.11 | 3,558.06 | 3,379.16 | 2,922.27 | 2,846.49 | 2,586.08 | 2,469.98 | 2,284.27 | 2,131.85 |
| Losses incurred | -- | -- | -- | -- | -- | -- | 1,498.13 | 1,345.07 | 1,234.80 | 1,148.54 |
| Loss expenses incurred | 3,164.48 | 2,484.29 | 2,111.78 | 1,813.98 | 1,635.82 | 1,551.49 | -- | -- | -- | -- |
| Policy acquisition costs | -- | -- | -- | -- | -- | -- | -- | 469.24 | 763.76 | 689.82 |
| Amortization of deferred policy acquisition costs | 922.43 | 796.18 | 705.82 | 626.47 | 560.27 | 535.97 | 495.04 | -- | -- | -- |
| Dividends to policyholders | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Goodwill impairment | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Corporate expenses | 34.60 | 30.69 | 31.12 | 28.31 | 25.41 | 30.90 | 25.45 | 36.26 | -- | -- |
| Other expenses | -- | -- | -- | -- | -- | -- | -- | (333.10) | (42.99) | (38.37) |
| Other insurance expenses | (453.24) | (433.74) | (400.31) | 375.93 | (366.94) | (358.07) | (331.32) | -- | -- | -- |
| Interest expense | 28.88 | 28.80 | 28.85 | 29.17 | 30.84 | 33.67 | 24.42 | 24.35 | 22.77 | 22.43 |
| Diversified Insurance Services expenses | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Income from continuing operations, before federal income tax | 258.03 | 458.41 | 280.19 | 505.31 | 302.99 | 336.39 | 211.72 | 261.97 | 219.96 | 232.69 |
| Current | 67.37 | 94.02 | 78.31 | 87.34 | 60.06 | 60.64 | 35.01 | 62.18 | 48.58 | 45.35 |
| Deferred | (16.35) | (0.85) | (23.01) | 14.14 | (3.43) | 4.13 | (2.23) | 30.96 | 12.88 | 21.48 |
| Total federal income tax (benefit) expense | 51.02 | 93.17 | 55.30 | 101.47 | 56.63 | 64.77 | 32.78 | 93.14 | 61.46 | 66.83 |
| Net income from continuing operations | -- | -- | -- | -- | -- | -- | -- | -- | -- | 165.86 |
| Income from discontinued operations, net of tax | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Loss on disposal of discontinued operations, net of tax | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Net income before cumulative effect of change in accounting principle | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Cumulative Effect of Change in Accounting Principle, Net of Tax | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Net income | 207.01 | 365.24 | 224.89 | 403.84 | -- | -- | -- | -- | -- | -- |
| Preferred stock dividends | 9.20 | 9.20 | 9.20 | 9.35 | -- | -- | -- | -- | -- | -- |
| Net income | 197.81 | 356.04 | 215.69 | 394.48 | 246.36 | 271.62 | 178.94 | 168.83 | 158.50 | 165.86 |
| Basic net income from continuing operations | -- | -- | -- | -- | -- | -- | -- | -- | -- | 2.90 |
| Basic net (loss) from discontinued operations | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Basic cumulative effect of change in accounting principle | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Basic earnings per share | 3.25 | 5.87 | 3.57 | 6.55 | 4.12 | 4.57 | 3.04 | 2.89 | 2.74 | 2.90 |
| Diluted net income from continuing operations | -- | -- | -- | -- | -- | -- | -- | -- | -- | 2.85 |
| Diluted net (loss) from discontinued operations | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Diluted cumulative effect of change in accounting principle | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Diluted earnings per share | 3.23 | 5.84 | 3.54 | 6.50 | 4.09 | 4.53 | 3.00 | 2.84 | 2.70 | 2.85 |
| Number of weighted average shares: Basic | 60.87 | 60.63 | 60.41 | 60.18 | 59.86 | 59.42 | 58.95 | 58.46 | 57.89 | 57.21 |
| Number of weighted average shares: Diluted | 61.27 | 60.97 | 60.88 | 60.67 | 60.29 | 60.00 | 59.71 | 59.36 | 58.75 | 58.16 |