Other Assets (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Right-of-use assets (Note 21)	$ 19.8	$ 15.2
Prepaid expenses	7.8	8.9
Investment income due and accrued	6.5	6.7
Receivable from carriers	6.1	3.8
Commission and service fee receivable	6.1	3.8
Security deposits	1.0	1.1
Other	0.1	2.9
Total other assets	$ 47.4	$ 42.4
Operating lease, right-of-use asset, statement of financial position	Total other assets	Total other assets