Other Liabilities and Accrued Expenses - Summary (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Other Liabilities Disclosure [Abstract]
Lease liabilities	$ 21.8	$ 23.8
Ceding commission payable	18.1	3.9
Accrued advertising costs	15.2	13.4
Uncertain tax position	10.5	9.7
Employee compensation	7.4	13.2
Payable to carriers	6.2	6.2
Accrued professional fees	5.5	5.1
Advance premium	5.4	3.1
Premium taxes payable	2.5	8.1
Reinsurance payable	1.6	2.8
Income taxes payable	1.0	1.5
Other payables	14.8	14.9
Total	$ 110.0	$ 105.7