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Schedule IV - Reinsurance (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Life insurance in force      
Life insurance in force gross amount $ 667,509.8 $ 626,155.6 $ 577,735.3
Life insurance in force ceded to other companies 383,937.7 377,308.2 368,583.0
Life insurance in force assumed from other companies 787.8 904.1 999.5
Life insurance in force net amount $ 284,359.9 $ 249,751.5 $ 210,151.8
Life insurance in force, percentage of amount assumed to net (as a percent) 0.30% 0.40% 0.50%
Premiums:      
Premiums gross amount $ 5,490.6 $ 6,645.4 $ 8,428.1
Premiums ceded to other companies 650.6 609.7 563.1
Premiums assumed from other companies 1.5 1.7 1.6
Premiums net amount 4,841.5 6,037.4 7,866.6
Life insurance and annuities      
Premiums:      
Premiums gross amount 3,323.3 4,608.7 6,424.8
Premiums ceded to other companies 494.9 453.1 407.5
Premiums assumed from other companies 1.5 1.7 1.6
Premiums net amount $ 2,829.9 4,157.3 6,018.9
Premiums percentage of amount assumed to net (as a percent) 0.10%    
Accident and health insurance      
Premiums:      
Premiums gross amount $ 2,167.3 2,036.7 2,003.3
Premiums ceded to other companies 155.7 156.6 155.6
Premiums net amount $ 2,011.6 $ 1,880.1 $ 1,847.7