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v3.25.4

Reinsurance (Schedule of Effects of Reinsurance) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Reinsurance Disclosures [Abstract] |  |  |
Property and casualty premiums written, Direct | $ 6,999.6 | $ 6,711.3 | $ 6,411.9
Property and casualty premiums written, Assumed | 23.0 | 21.6 | 21.0
Property and casualty premiums written, Ceded | (700.5) | (649.3) | (622.7)
Property and casualty premiums written, Net | 6,322.1 | 6,083.6 | 5,810.2
Property and casualty premiums earned, Direct | 6,829.8 | 6,551.0 | 6,255.1
Property and casualty premiums earned, Assumed | 22.9 | 21.5 | 37.4
Property and casualty premiums earned, Ceded | (691.6) | (659.9) | (629.4)
Premiums Earned, Net, Total | $ 6,161.1 | $ 5,912.6 | $ 5,663.1
Percentage of assumed to net premiums earned | 0.40% | 0.40% | 0.70%
Property and casualty losses and LAE, Direct | $ 4,098.0 | $ 4,157.5 | $ 4,489.4
Property and casualty losses and LAE, Assumed | 19.5 | 19.0 | 42.5
Property and casualty losses and LAE, Ceded | (388.2) | (419.1) | (397.3)
Total losses and LAE | $ 3,729.3 | $ 3,757.4 | $ 4,134.6

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