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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, 2022 | Dec. 31, 2021
Written |  |
Net premiums | $ 38.3 |
Earned |  |
Net premiums | 26.4 |
WNFIC |  |
Written |  |
Direct premiums | 740.9 | $ 747.4
Ceded premiums | (740.9) | (747.4)
Earned |  |
Direct premiums | 751.3 | 732.8
Ceded premiums | (751.3) | $ (732.8)
Quota Share Captive and Excess of Loss Layer Captive |  |
Written |  |
Assumed premiums | 65.4 |
Net premiums | 38.3 |
Earned |  |
Assumed premiums | 43.7 |
Net premiums | 26.4 |
Quota Share Captive |  |
Written |  |
Ceded premiums | (27.1) |
Net premiums | 38.3 |
Earned |  |
Ceded premiums | (17.3) |
Net premiums | $ 20.6 |

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