Reinsurance (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Direct Amount
Net premiums written and contract deposits, Direct Amount	$ 402.4	$ 386.4
Net premiums and contract charges earned, Direct Amount	306.7	288.0
Benefits, claims and settlement expenses, Direct Amount	189.6	186.9
Ceded to Other Companies
Net premiums written and contract deposits, Ceded to Other Companies	15.1	18.1
Net premiums and contract charges earned, Ceded to Other Companies	14.4	19.8
Benefits, claims and settlement expenses, Ceded to Other Companies	11.0	14.6
Assumed from Other Companies
Net premiums written and contract deposits, Assumed from Other Companies	5.9	7.3
Net premiums and contract charges earned, Assumed from Other Companies	6.0	7.0
Benefits, claims and settlement expenses, Assumed from Other Companies	4.6	4.0
Net Amount
Net premiums written and contract deposits, Net Amount	393.2	375.6
Net premiums and contract charges earned, Net Amount	298.3	275.2
Benefits, claims and settlement expenses, Net Amount	$ 183.2	$ 176.3