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Schedule IV - Reinsurance (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Life insurance in force      
Life insurance in force gross amount $ 741,781.1 $ 717,991.5 $ 692,200.8
Life insurance in force ceded to other companies 236,556.4 230,126.5 223,416.6
Life insurance in force assumed from other companies 298.8 446.6 627.4
Life insurance in force net amount $ 505,523.5 $ 488,311.6 $ 469,411.6
Life insurance in force, percentage of amount assumed to net (as a percent) 0.10% 0.10% 0.10%
Premiums:      
Premiums gross amount $ 7,381.2 $ 6,961.3 $ 5,795.1
Premiums ceded to other companies 531.6 491.3 456.4
Premiums assumed from other companies 0.6 0.9 1.0
Premiums net amount 6,850.2 6,470.9 5,339.7
Life insurance and annuities      
Premiums:      
Premiums gross amount 4,674.8 4,384.6 3,402.7
Premiums ceded to other companies 380.8 335.1 298.6
Premiums assumed from other companies 0.6 0.9 1.0
Premiums net amount 4,294.6 4,050.4 3,105.1
Accident and health insurance      
Premiums:      
Premiums gross amount 2,706.4 2,576.7 2,392.4
Premiums ceded to other companies 150.8 156.2 157.8
Premiums net amount $ 2,555.6 $ 2,420.5 $ 2,234.6