| Revenues | — | — | — |
| Net earned premiums | 9,795.8a | 9,388a | 8,765.3a |
| Fees and other income | 1,638.6a | 1,323.2a | 1,243.3a |
| Net investment income | 518.9a | 489.1a | 364.1a |
| Net realized losses on investments (including $25.1, $17.0 and $4.6 of impairment-related losses for the years ended December 31, 2024, 2023 and 2022, respectively) and fair value changes to equity securities | -75.8a | -68.7a | -179.7a |
| Total revenues | 11,877.5a | 11,131.6a | 10,193a |
| Benefits, losses and expenses | — | — | — |
| Policyholder benefits | -2,766.5a | -2,521.8a | -2,359.8a |
| Underwriting, selling, general and administrative expenses | -8,076.7a | -7,695.1a | -7,366.3a |
| Goodwill impairment | | | -7.8a |
| Interest expense | -107a | -108a | -108.3a |
| (Gain) loss on extinguishment of debt | | -0.1a | 0.9a |
| Total benefits, losses and expenses | -10,950.2a | -10,324.8a | -9,843.1a |
| Income before income tax expense | 927.3a | 806.8a | 349.9a |
| Income tax expense | -167.1a | -164.3a | -73.3a |
| Net income | 760.2a | 642.5a | 276.6a |