Unpaid Loss and Loss Adjustment Expense - Unpaid Loss and Loss Adjustment Expenses (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Claims Development [Line Items]
Unpaid Loss and ALAE, net	$ 148.6
Reinsurance recoverable on Unpaid Loss and ALAE, net	149.5	$ 120.2	$ 124.6	$ 72.7
Unallocated LAE	0.0
Gross unpaid loss and ALAE	298.1	$ 262.3	$ 256.2	$ 97.9
Home and renters
Claims Development [Line Items]
Unpaid Loss and ALAE, net	83.8
Reinsurance recoverable on Unpaid Loss and ALAE, net	109.3
Gross unpaid loss and ALAE	193.1
Pet
Claims Development [Line Items]
Unpaid Loss and ALAE, net	4.8
Reinsurance recoverable on Unpaid Loss and ALAE, net	6.2
Gross unpaid loss and ALAE	11.0
Car
Claims Development [Line Items]
Unpaid Loss and ALAE, net	60.0
Reinsurance recoverable on Unpaid Loss and ALAE, net	34.0
Gross unpaid loss and ALAE	$ 93.7