Reinsurance - Reinsurance Recoverable (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Insurance [Abstract]
Reinsurance recoverable on paid losses	$ 18.2	$ 32.2
Ceded unpaid loss and LAE	120.2	124.6	$ 72.7
Total reinsurance recoverable	138.4	156.8
Reinsurance Recovery For Unpaid Claims And Claims Adjustment, Less Unallocated Loss Adjustment Expense	$ 120.2	$ 124.6