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Reinsurance - Summary of Reinsurance Activity (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Direct Amount    
Net premiums written and contract deposits, Direct Amount $ 386.4 $ 367.8
Net premiums and contract charges earned, Direct Amount 288.0 264.0
Benefits, claims and settlement expenses, Direct Amount 186.9 192.9
Ceded to Other Companies    
Net premiums written and contract deposits, Ceded to Other Companies 18.1 16.6
Net premiums and contract charges earned, Ceded to Other Companies 19.8 18.5
Benefits, claims and settlement expenses, Ceded to Other Companies 14.6 12.7
Assumed from Other Companies    
Net premiums written and contract deposits, Assumed from Other Companies 7.3 10.4
Net premiums and contract charges earned, Assumed from Other Companies 7.0 10.4
Benefits, claims and settlement expenses, Assumed from Other Companies 4.0 3.0
Net Amount    
Net premiums written and contract deposits, Net Amount 375.6 361.6
Net premiums and contract charges earned, Net Amount 275.2 255.9
Benefits, claims and settlement expenses, Net Amount $ 176.3 $ 183.2