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Reinsurance Reinsurance Premium Note (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Premiums Written, Net      
Direct premiums, written $ 582.6 $ 570.8 $ 687.4
Assumed premiums written 7.1 9.3 9.5
Gross premiums written 589.7 580.1 696.9
Ceded premiums written (6.6) (5.2) (5.4)
Premiums written, net 583.1 574.9 691.5
Premiums Earned, Net      
Direct premiums earned 574.0 611.0 691.6
Assumed premiums earned 7.0 9.5 9.6
Gross premiums, earned 581.0 620.5 701.2
Ceded premiums earned (6.6) (5.2) (5.4)
Premiums earned, net 574.4 615.3 695.8
Ceded losses and LAE incurred $ 16.8 $ 5.9 $ 19.2