Reinsurance - Ceded Reinsurance (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Written premiums
Direct	$ 161.7	$ 129.3	$ 278.8	$ 224.3
Assumed	0.1	(0.7)	0.1	3.4
Gross	161.8	128.6	278.9	227.7
Ceded	(147.2)	(116.4)	(263.6)	(208.4)
Net	14.6	12.2	15.3	19.3
Earned premiums
Direct	128.8	83.9	248.8	154.9
Assumed	0.0	3.2	0.1	6.6
Gross	128.8	87.1	248.9	161.5
Ceded	(117.6)	(76.9)	(228.7)	(142.5)
Net	11.2	10.2	20.2	19.0
Loss and LAE incurred
Direct	99.0	135.7	189.9	276.1
Assumed	2.0	4.8	2.3	10.1
Gross	101.0	140.5	192.2	286.2
Ceded	(71.8)	(119.1)	(140.5)	(247.5)
Net	$ 29.2	$ 21.4	$ 51.7	$ 38.7

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