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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