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Schedule IV - Reinsurance (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Life insurance in force      
Life insurance in force gross amount $ 692,200.8 $ 667,509.8 $ 626,155.6
Life insurance in force ceded to other companies 223,416.6 383,937.7 377,308.2
Life insurance in force assumed from other companies 627.4 787.8 904.1
Life insurance in force net amount $ 469,411.6 $ 284,359.9 $ 249,751.5
Life insurance in force, percentage of amount assumed to net (as a percent) 0.10% 0.30% 0.40%
Premiums:      
Premiums gross amount $ 5,795.1 $ 5,490.6 $ 6,645.4
Premiums ceded to other companies 456.4 650.6 609.7
Premiums assumed from other companies 1.0 1.5 1.7
Premiums net amount 5,339.7 4,841.5 6,037.4
Life insurance and annuities      
Premiums:      
Premiums gross amount 3,414.2 3,323.3 4,608.7
Premiums ceded to other companies 298.6 494.9 453.1
Premiums assumed from other companies 1.0 1.5 1.7
Premiums net amount 3,116.6 $ 2,829.9 4,157.3
Premiums percentage of amount assumed to net (as a percent)   0.10%  
Accident and health insurance      
Premiums:      
Premiums gross amount 2,380.9 $ 2,167.3 2,036.7
Premiums ceded to other companies 157.8 155.7 156.6
Premiums net amount $ 2,223.1 $ 2,011.6 $ 1,880.1