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Statutory Financial Information, Capital Requirements, and Restrictions on Dividends and Transfers of Funds (Tables) | 12 Months Ended
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Dec. 31, 2023
Insurance [Abstract] |
Schedule of Insurance Subsidiaries Statutory Surplus Data |
|  | State of Domicile |  | Unassigned Surplus |  | Statutory Surplus |  | Statutory Net Income
($ in millions) |  |  |  | 2023 |  | 2022 |  | 2023 |  | 2022 |  | 2023 |  | 2022 |  | 2021
SICA |  | New Jersey |  | $ | 773.6 |  |  | 686.6 |  |  | 938.8 |  |  | 851.8 |  |  | 120.4 |  |  | 103.1 |  |  | 134.7 |
Selective Way Insurance Company ("SWIC") |  | New Jersey |  | 513.5 |  |  | 461.9 |  |  | 569.3 |  |  | 517.8 |  |  | 64.1 |  |  | 69.6 |  |  | 74.5 |
SICSC |  | Indiana |  | 201.3 |  |  | 164.1 |  |  | 235.6 |  |  | 198.4 |  |  | 26.0 |  |  | 17.0 |  |  | 24.2 |
SICSE |  | Indiana |  | 155.1 |  |  | 135.9 |  |  | 182.7 |  |  | 163.5 |  |  | 21.6 |  |  | 14.2 |  |  | 19.4 |
SICNY |  | New York |  | 152.4 |  |  | 137.4 |  |  | 180.1 |  |  | 165.1 |  |  | 16.4 |  |  | 13.2 |  |  | 18.6 |
Selective Insurance Company of New England ("SICNE") |  | New Jersey |  | 45.5 |  |  | 38.2 |  |  | 76.7 |  |  | 69.3 |  |  | 8.3 |  |  | 5.1 |  |  | 7.5 |
Selective Auto Insurance Company of New Jersey ("SAICNJ") |  | New Jersey |  | 119.3 |  |  | 102.2 |  |  | 164.2 |  |  | 147.1 |  |  | 16.2 |  |  | 12.7 |  |  | 16.7 |
Mesa Underwriters Specialty Insurance Company ("MUSIC") |  | New Jersey |  | 64.3 |  |  | 52.8 |  |  | 133.7 |  |  | 122.3 |  |  | 14.4 |  |  | 9.7 |  |  | 13.9 |
Selective Casualty Insurance Company ("SCIC") |  | New Jersey |  | 107.8 |  |  | 91.4 |  |  | 184.3 |  |  | 167.9 |  |  | 24.0 |  |  | 14.0 |  |  | 20.6 |
Selective Fire and Casualty Insurance Company ("SFCIC") |  | New Jersey |  | 43.9 |  |  | 37.6 |  |  | 76.9 |  |  | 70.5 |  |  | 7.4 |  |  | 5.8 |  |  | 8.2 |
Total |  |  |  | $ | 2,176.7 |  |  | 1,908.1 |  |  | 2,742.3 |  |  | 2,473.7 |  |  | 318.8 |  |  | 264.4 |  |  | 338.3 |
Schedule of Insurance Subsidiaries Dividend Paid To Parent |
Dividends |  |  |  | Twelve Months ended December 31, 2023 |  | 2024 |  |  |  |
($ in millions) |  | State of Domicile |  | Ordinary Dividends Paid |  | Maximum Ordinary Dividends |  |  |  |
SICA |  | New Jersey |  | $ | 41.5 |  |  | $ | 117.7 |  |  |  |  |
SWIC |  | New Jersey |  | 16.3 |  |  | 62.4 |  |  |  |  |
SICSC |  | Indiana |  | 3.8 |  |  | 26.0 |  |  |  |  |
SICSE |  | Indiana |  | 4.4 |  |  | 21.6 |  |  |  |  |
SICNY |  | New York |  | 2.0 |  |  | 18.0 |  |  |  |  |
SICNE |  | New Jersey |  | 1.0 |  |  | 8.1 |  |  |  |  |
SAICNJ |  | New Jersey |  | 0.8 |  |  | 16.4 |  |  |  |  |
MUSIC |  | New Jersey |  | 3.5 |  |  | 14.3 |  |  |  |  |
SCIC |  | New Jersey |  | 5.2 |  |  | 24.0 |  |  |  |  |
SFCIC |  | New Jersey |  | 1.5 |  |  | 7.7 |  |  |  |  |
Total |  |  |  | $ | 80.0 |  |  | $ | 316.2 |  |  |  |  |

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- Definition Tabular disclosure of the dividends paid to the Parent by a Subsidiary. + References No definition available. + Details
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