Off Balance Sheet Items (Details) - Affiliated Entity - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Insurance Fund Expense
Related Party Transaction [Line Items]
Related party transaction expenses	$ 0.1	$ 0.0	$ 0.2	$ 0.5
Management Expense
Related Party Transaction [Line Items]
Related party transaction expenses	0.1	0.1	0.1	0.3
Audit Fees
Related Party Transaction [Line Items]
Related party transaction expenses	$ 0.0	$ 0.1	$ 0.6	$ 0.6