Reinsurance - Ceded Reinsurance (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Written Premiums
Direct	$ 628.3	$ 474.0
Assumed	1.6	3.3
Gross	629.9	477.3
Ceded	(580.3)	(434.8)
Net	49.6	42.5
Earned Premiums
Direct	541.1	364.7
Assumed	0.4	9.8
Gross	541.5	374.5
Ceded	(499.0)	(335.6)
Net	42.5	38.9
Loss and LAE Incurred
Direct	409.6	498.5
Assumed	0.1	16.9
Gross	409.7	515.4
Ceded	(308.3)	(431.0)
Net	$ 101.4	$ 84.4

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