| Fiscal period | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 |
| Period End Date | 12/31/2025 | 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 |
| Net premiums earned | 7,788.70 | 7,026.40 | 6,445.90 | 7,342.10 | 7,559.80 | 6,345.80 | 5,498.30 | 5,253.40 | 5,080.20 | 4,868.90 |
| Realized Investment Gains | 179.70 | 69.90 | (190.90) | (201.10) | 758.00 | 14.20 | -- | (235.60) | 211.60 | 72.80 |
| Realized investment gains (losses) from impairments | -- | -- | -- | -- | -- | -- | 36.60 | -- | -- | -- |
| Net investment income | 708.70 | 673.10 | 578.30 | 459.50 | 434.30 | 438.90 | 450.70 | 431.80 | 409.40 | 387.00 |
| Other income (loss) | 194.90 | 177.60 | 163.10 | 149.90 | 145.60 | 131.20 | 132.60 | 121.60 | 102.20 | 107.30 |
| Title, escrow, and other fees | 264.10 | 284.40 | 261.80 | 333.20 | 443.80 | 391.90 | 495.90 | 450.50 | 459.50 | 464.20 |
| Unrealized investment gains (loss) from changes in fair value of equity securities | -- | -- | -- | -- | -- | (156.20) | 599.50 | -- | -- | -- |
| Total Revenues | 9,136.30 | 8,231.50 | 7,258.30 | 8,083.70 | 9,341.60 | 7,166.00 | 7,213.70 | 6,021.80 | 6,263.10 | 5,900.50 |
| Benefits, claims, and settlement expenses | 3,361.10 | 3,024.40 | 2,580.00 | 2,427.70 | 2,398.20 | 2,472.50 | 2,545.30 | 2,440.90 | 2,459.20 | 2,329.80 |
| Underwriting, acquisition, and other expenses | 4,504.50 | 4,036.40 | 3,843.60 | 4,719.20 | 4,942.30 | 3,942.40 | 3,278.50 | 3,080.60 | 2,995.70 | 2,816.30 |
| Interest and other charges | 70.30 | 77.30 | 70.50 | 66.70 | 56.20 | 43.70 | 40.00 | 42.20 | 63.00 | 50.20 |
| Dividends to policyholders | (16.20) | (23.50) | (16.50) | (12.50) | (22.70) | (18.90) | (27.30) | (19.80) | (19.50) | (18.10) |
| Income before income taxes | 1,184.00 | 1,069.70 | 747.40 | 857.40 | 1,922.10 | 688.40 | 1,322.40 | 438.10 | 725.40 | 686.00 |
| Total Income Taxes | 242.10 | 216.90 | 148.70 | 170.90 | 387.70 | 129.70 | 265.90 | 67.50 | 164.80 | 219.00 |
| Income Taxes:Current | 225.20 | 205.20 | 186.20 | 226.00 | 221.70 | 156.90 | 238.40 | 114.10 | 132.60 | 190.10 |
| Income Taxes:Deferred (Credits) | 16.80 | 11.70 | (37.40) | (55.10) | 165.90 | (27.10) | 27.40 | (46.50) | 32.20 | 28.80 |
| Equity in earnings of unconsolidated subsidiaries and minority interests | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Consolidated Net income | 941.90 | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Net income attributable tononcontrolling interests | 6.50 | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Net income (loss) available to common shareholders | 935.40 | 852.70 | 598.60 | 686.40 | 1,534.30 | 558.60 | 1,056.40 | 370.50 | 560.50 | 466.90 |
| Net Income Per Share: Basic: | 3.82 | 3.30 | 2.12 | 2.28 | 5.08 | 1.87 | 3.52 | 1.26 | 2.14 | 1.80 |
| Net Income Per Share: Diluted: | 3.72 | 3.24 | 2.10 | 2.26 | 5.05 | 1.87 | 3.51 | 1.24 | 1.92 | 1.62 |
| Average shares outstanding: Basic | 245.12 | 258.03 | 282.73 | 301.68 | 301.95 | 298.41 | 299.89 | 294.25 | 262.12 | 259.43 |
| Average shares outstanding: Diluted | 251.31 | 262.88 | 285.47 | 303.30 | 303.67 | 298.90 | 299.89 | 301.02 | 299.39 | 296.38 |