Other Liabilities and Accrued Expenses (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Other Liabilities Disclosure [Abstract]
Deferred ceding commission	$ 22.4	$ 0.0
Ceded premium payable	13.0	3.9
Accrued advertising costs	6.8	7.9
Employee compensation payable	3.7	1.0
Premium taxes payable	3.2	2.6
Accrued professional fees	2.6	2.8
Income tax payable	0.3	0.5
VAT payable	0.2	0.4
Other payables	1.9	0.6
Total other liabilities and accrued expenses	$ 54.1	$ 19.7