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SCHEDULE IV - REINSURANCE (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]      
Assumed $ 15.5 $ 16.6 $ 18.6
Reinsurance ceded (191.8) (194.6) (214.6)
Premiums on traditional products with mortality or morbidity risk 2,339.4 2,303.7 2,309.9
Life insurance inforce:      
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]      
Direct 32,283.5 31,335.5 30,444.8
Assumed 77.0 82.0 86.5
Ceded (2,804.1) (2,804.9) (2,820.0)
Net insurance inforce $ 29,556.4 $ 28,612.6 $ 27,711.3
Percentage of assumed to net 0.30% 0.30% 0.30%
Insurance policy income:      
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]      
Direct $ 2,492.9 $ 2,468.5 $ 2,483.1
Assumed 15.5 16.6 18.7
Reinsurance ceded (169.0) (181.4) (191.9)
Premiums on traditional products with mortality or morbidity risk $ 2,339.4 $ 2,303.7 $ 2,309.9
Percentage of assumed to net 0.70% 0.70% 0.80%