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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, 2017
Insurance [Abstract] |
Schedule of Insurance Subsidiaries Statutory Surplus Data |
|  | State of Domicile |  | Unassigned Surplus |  | Statutory Surplus |  | Statutory Net Income
($ in millions) |  |  |  | 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2015
SICA |  | New Jersey |  | $ | 455.5 |  |  | 414.4 |  |  | 609.7 |  |  | 568.6 |  |  | 84.6 |  |  | 72.2 |  |  | 69.6 |
Selective Way Insurance Company ("SWIC") |  | New Jersey |  | 276.1 |  |  | 260.5 |  |  | 325.1 |  |  | 309.5 |  |  | 43.6 |  |  | 41.2 |  |  | 42.3 |
SICSC |  | Indiana |  | 112.9 |  |  | 110.6 |  |  | 144.1 |  |  | 141.9 |  |  | 17.9 |  |  | 17.4 |  |  | 15.9 |
SICSE |  | Indiana |  | 86.2 |  |  | 83.5 |  |  | 111.8 |  |  | 109.1 |  |  | 14.7 |  |  | 13.4 |  |  | 12.1 |
SICNY |  | New York |  | 78.8 |  |  | 74.1 |  |  | 106.5 |  |  | 101.8 |  |  | 13.4 |  |  | 12.9 |  |  | 12.7 |
Selective Insurance Company of New England ("SICNE") |  | New Jersey |  | 16.1 |  |  | 13.6 |  |  | 46.3 |  |  | 43.7 |  |  | 6.3 |  |  | 5.9 |  |  | 5.5 |
Selective Auto Insurance Company of New Jersey ("SAICNJ") |  | New Jersey |  | 42.1 |  |  | 36.9 |  |  | 84.9 |  |  | 79.8 |  |  | 11.4 |  |  | 11.5 |  |  | 10.8 |
MUSIC |  | New Jersey |  | 21.4 |  |  | 16.7 |  |  | 89.9 |  |  | 85.2 |  |  | 10.3 |  |  | 9.7 |  |  | 9.5 |
Selective Casualty Insurance Company ("SCIC") |  | New Jersey |  | 34.5 |  |  | 26.6 |  |  | 109.0 |  |  | 101.0 |  |  | 13.4 |  |  | 12.6 |  |  | 12.1 |
Selective Fire and Casualty Insurance Company ("SFCIC") |  | New Jersey |  | 13.7 |  |  | 11.3 |  |  | 45.6 |  |  | 43.2 |  |  | 5.6 |  |  | 5.5 |  |  | 5.3 |
Total |  |  |  | $ | 1,137.3 |  |  | 1,048.2 |  |  | 1,672.9 |  |  | 1,583.8 |  |  | 221.2 |  |  | 202.3 |  |  | 195.8 |
Schedule of Insurance Subsidiaries Dividend Paid To Parent |
Dividends |  |  |  | Twelve Months ended December 31, 2017
($ in millions) |  | State of Domicile |  | Ordinary Dividends Paid
SICA |  | New Jersey |  | $ | 28.0 |
SWIC |  | New Jersey |  | 19.0 |
SICSC |  | Indiana |  | 10.0 |
SICSE |  | Indiana |  | 7.5 |
SICNY |  | New York |  | 4.5 |
SICNE |  | New Jersey |  | 2.0 |
SAICNJ |  | New Jersey |  | 2.5 |
MUSIC |  | New Jersey |  | 2.1 |
SCIC |  | New Jersey |  | 3.0 |
SFCIC |  | New Jersey |  | 1.5 |
Total |  |  |  | $ | 80.1 |
Schedule of Maximum Ordinary Dividends Paid to Parent by Insurance Subsidiaries |
|  |  |  | 2018
($ in millions) |  | State of Domicile |  | Maximum Ordinary Dividends
SICA |  | New Jersey |  | $ | 77.6 |
SWIC |  | New Jersey |  | 43.3 |
SICSC |  | Indiana |  | 17.9 |
SICSE |  | Indiana |  | 14.7 |
SICNY |  | New York |  | 10.7 |
SICNE |  | New Jersey |  | 6.2 |
SAICNJ |  | New Jersey |  | 11.3 |
MUSIC |  | New Jersey |  | 10.3 |
SCIC |  | New Jersey |  | 13.4 |
SFCIC |  | New Jersey |  | 5.6 |
Total |  |  |  | $ | 211.0 |

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