Reinsurance - Summary of Effects of Reinsurance (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Written premiums
Direct	$ 225.9	$ 173.0	$ 651.8	$ 451.8
Assumed	3.6	0.3	11.8	0.4
Gross	229.5	173.3	663.6	452.2
Ceded	(178.0)	(167.3)	(559.8)	(430.9)
Net	51.5	6.0	103.8	21.3
Earned premiums
Direct	207.7	139.7	557.3	388.5
Assumed	3.0	0.1	5.7	0.2
Gross	210.7	139.8	563.0	388.7
Ceded	(177.8)	(129.1)	(494.0)	(357.8)
Net	32.9	10.7	69.0	30.9
Loss and LAE incurred
Direct	120.7	155.3	441.4	345.2
Assumed	3.8	(1.6)	9.5	0.7
Gross	124.5	153.7	450.9	345.9
Ceded	(88.0)	(129.8)	(300.0)	(270.3)
Net	$ 36.5	$ 23.9	$ 150.9	$ 75.6

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