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Reinsurance - Summary of Reinsurance Activity (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Direct Amount        
Net premiums written and contract deposits, Direct Amount $ 424.0 $ 391.2 $ 1,186.5 $ 1,127.1
Net premiums and contract charges earned, Direct Amount 276.7 261.6 812.3 782.5
Benefits, claims and settlement expenses, Direct Amount 205.2 170.9 615.6 564.9
Ceded to Other Companies        
Net premiums written and contract deposits, Ceded to Other Companies 16.5 15.4 51.0 46.7
Net premiums and contract charges earned, Ceded to Other Companies 18.7 17.6 57.2 53.5
Benefits, claims and settlement expenses, Ceded to Other Companies 9.1 8.3 36.1 34.1
Assumed from Other Companies        
Net premiums written and contract deposits, Assumed from Other Companies 8.4 13.4 28.2 39.5
Net premiums and contract charges earned, Assumed from Other Companies 8.0 13.4 27.5 39.6
Benefits, claims and settlement expenses, Assumed from Other Companies 3.1 4.6 8.1 14.9
Net Amount        
Net premiums written and contract deposits, Net Amount 415.9 389.2 1,163.7 1,119.9
Net premiums and contract charges earned, Net Amount 266.0 257.4 782.6 768.6
Benefits, claims and settlement expenses, Net Amount $ 199.2 $ 167.1 $ 587.6 $ 545.7