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Reinsurance - Ceded Reinsurance (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Written Premiums
Direct	$ 834.6	$ 628.3
Assumed	12.7	1.6
Gross	847.3	629.9
Ceded	(687.7)	(580.3)
Net	159.6	49.6
Earned Premiums
Direct	760.5	541.1
Assumed	8.8	0.4
Gross	769.3	541.5
Ceded	(661.8)	(499.0)
Net	107.5	42.5
Loss and LAE Incurred
Direct	531.8	409.6
Assumed	11.7	0.1
Gross	543.5	409.7
Ceded	(361.8)	(308.3)
Net	$ 181.7	$ 101.4

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