Reinsurance (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Direct Amount
Net premiums written and contract deposits, Direct Amount	$ 468.6	$ 427.6	$ 1,298.9	$ 1,227.8
Net premiums and contract charges earned, Direct Amount	315.6	296.0	934.2	877.1
Benefits, claims and settlement expenses, Direct Amount	179.1	196.6	560.8	596.5
Ceded to Other Companies
Net premiums written and contract deposits, Ceded to Other Companies	13.9	17.6	44.4	53.8
Net premiums and contract charges earned, Ceded to Other Companies	14.0	13.1	43.7	52.7
Benefits, claims and settlement expenses, Ceded to Other Companies	12.1	11.2	34.1	36.0
Assumed from Other Companies
Net premiums written and contract deposits, Assumed from Other Companies	14.2	6.3	26.4	21.4
Net premiums and contract charges earned, Assumed from Other Companies	8.6	6.2	20.6	20.8
Benefits, claims and settlement expenses, Assumed from Other Companies	4.0	5.9	11.0	14.4
Net Amount
Net premiums written and contract deposits, Net Amount	468.9	416.3	1,280.9	1,195.4
Net premiums and contract charges earned, Net Amount	310.3	289.1	911.2	845.2
Benefits, claims and settlement expenses, Net Amount	$ 171.0	$ 191.3	$ 537.7	$ 574.9