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Insurance Company Subsidiary Operations - Effects of Reinsurance on Premiums Written and Earned (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Written |  |
Net premiums | $ 61.1 | $ 38.3
Earned |  |
Net premiums | 27.7 | 26.4
WNFIC |  |
Written |  |
Direct premiums | 886.5 | 740.9
Ceded premiums | 886.5 | 740.9
Earned |  |
Direct premiums | 807.4 | 751.3
Ceded premiums | (807.4) | (751.3)
Quota Share Captive and Excess of Loss Layer Captive |  |
Written |  |
Assumed premiums | 113.2 | 65.4
Net premiums | 61.1 | 38.3
Earned |  |
Assumed premiums | 89.6 | 43.7
Net premiums | 27.7 | 26.4
Quota Share Captive |  |
Written |  |
Ceded premiums | 52.1 | 27.1
Net premiums | 57.6 |
Earned |  |
Ceded premiums | (61.9) | $ (17.3)
Net premiums | $ 24.2 |

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