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Schedule IV - Reinsurance (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Life insurance in force      
Life insurance in force gross amount $ 717,991.5 $ 692,200.8 $ 667,509.8
Life insurance in force ceded to other companies 230,126.5 223,416.6 383,937.7
Life insurance in force assumed from other companies 446.6 627.4 787.8
Life insurance in force net amount $ 488,311.6 $ 469,411.6 $ 284,359.9
Life insurance in force, percentage of amount assumed to net (as a percent) 0.10% 0.10% 0.30%
Premiums:      
Premiums gross amount $ 6,961.3 $ 5,795.1 $ 5,490.6
Premiums ceded to other companies 491.3 456.4 650.6
Premiums assumed from other companies 0.9 1.0 1.5
Premiums net amount 6,470.9 5,339.7 4,841.5
Life insurance and annuities      
Premiums:      
Premiums gross amount 4,384.6 3,402.7 3,314.3
Premiums ceded to other companies 335.1 298.6 494.9
Premiums assumed from other companies 0.9 1.0 1.5
Premiums net amount 4,050.4 3,105.1 $ 2,820.9
Premiums percentage of amount assumed to net (as a percent)     0.10%
Accident and health insurance      
Premiums:      
Premiums gross amount 2,576.7 2,392.4 $ 2,176.3
Premiums ceded to other companies 156.2 157.8 155.7
Premiums net amount $ 2,420.5 $ 2,234.6 $ 2,020.6