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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, 2020
Insurance [Abstract] |
Schedule of Insurance Subsidiaries Statutory Surplus Data |
|  | State of Domicile |  | Unassigned Surplus |  | Statutory Surplus |  | Statutory Net Income
($ in millions) |  |  |  | 2020 |  | 2019 |  | 2020 |  | 2019 |  | 2020 |  | 2019 |  | 2018
SICA |  | New Jersey |  | $ | 574.2 |  |  | 525.9 |  |  | 739.4 |  |  | 680.1 |  |  | 81.8 |  |  | 113.9 |  |  | 78.0 |
Selective Way Insurance Company ("SWIC") |  | New Jersey |  | 374.0 |  |  | 339.2 |  |  | 430.0 |  |  | 388.2 |  |  | 54.0 |  |  | 59.2 |  |  | 47.5 |
SICSC |  | Indiana |  | 148.6 |  |  | 132.6 |  |  | 182.8 |  |  | 163.8 |  |  | 20.8 |  |  | 23.9 |  |  | 16.5 |
SICSE |  | Indiana |  | 115.9 |  |  | 103.1 |  |  | 143.5 |  |  | 128.7 |  |  | 16.8 |  |  | 18.5 |  |  | 12.9 |
SICNY |  | New York |  | 111.7 |  |  | 99.4 |  |  | 139.4 |  |  | 127.1 |  |  | 15.3 |  |  | 17.0 |  |  | 12.0 |
Selective Insurance Company of New England ("SICNE") |  | New Jersey |  | 30.0 |  |  | 25.3 |  |  | 61.2 |  |  | 55.4 |  |  | 6.8 |  |  | 7.8 |  |  | 5.6 |
Selective Auto Insurance Company of New Jersey ("SAICNJ") |  | New Jersey |  | 70.0 |  |  | 62.5 |  |  | 114.9 |  |  | 105.4 |  |  | 12.9 |  |  | 14.9 |  |  | 9.9 |
MUSIC |  | New Jersey |  | 34.4 |  |  | 27.1 |  |  | 103.9 |  |  | 95.6 |  |  | 11.4 |  |  | 13.2 |  |  | 9.4 |
Selective Casualty Insurance Company ("SCIC") |  | New Jersey |  | 71.1 |  |  | 58.2 |  |  | 147.5 |  |  | 132.7 |  |  | 16.2 |  |  | 16.8 |  |  | 13.3 |
Selective Fire and Casualty Insurance Company ("SFCIC") |  | New Jersey |  | 29.2 |  |  | 23.5 |  |  | 62.1 |  |  | 55.4 |  |  | 6.4 |  |  | 7.5 |  |  | 5.5 |
Total |  |  |  | $ | 1,559.1 |  |  | 1,396.8 |  |  | 2,124.7 |  |  | 1,932.4 |  |  | 242.4 |  |  | 292.7 |  |  | 210.6 |
Schedule of Insurance Subsidiaries Dividend Paid To Parent |
Dividends |  |  |  | Twelve Months ended December 31, 2020 |  | 2021 |  |  |  |
($ in millions) |  | State of Domicile |  | Ordinary Dividends Paid |  | Maximum Ordinary Dividends |  |  |  |
SICA |  | New Jersey |  | $ | 46.6 |  |  | $ | 81.8 |  |  |  |  |
SWIC |  | New Jersey |  | 22.5 |  |  | 54.1 |  |  |  |  |
SICSC |  | Indiana |  | 7.5 |  |  | 20.8 |  |  |  |  |
SICSE |  | Indiana |  | 5.3 |  |  | 16.8 |  |  |  |  |
SICNY |  | New York |  | 3.0 |  |  | 13.9 |  |  |  |  |
SICNE |  | New Jersey |  | 2.2 |  |  | 6.7 |  |  |  |  |
SAICNJ |  | New Jersey |  | 5.9 |  |  | 12.9 |  |  |  |  |
MUSIC |  | New Jersey |  | 6.0 |  |  | 11.4 |  |  |  |  |
SCIC |  | New Jersey |  | 5.2 |  |  | 16.2 |  |  |  |  |
SFCIC |  | New Jersey |  | 0.8 |  |  | 6.4 |  |  |  |  |
Total |  |  |  | $ | 105.0 |  |  | $ | 241.0 |  |  |  |  |

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