Deferred Acquisition Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Deferred Acquisition Costs:
Balance, January 1	$ 12.2	$ 8.8
Add:
Premium taxes	23.1	21.2
Direct commissions	8.9	12.7
Less:
Amortization of net deferred acquisition costs	(32.1)	(30.5)	$ (21.8)
Balance, December 31	12.1	12.2	8.8
Other Insurance Expense:
Amortization of net deferred acquisition costs	32.1	30.5	21.8
Period costs	61.6	46.3
Total other insurance expense	$ 93.7	$ 76.8	$ 59.2