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Employee and Agent Benefits - ABO in Excess of Plan Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Pension benefits    
Information for Defined Benefit Plans With an Accumulated Benefit Obligation in Excess of Plan Assets    
Projected benefit obligation for defined benefit plans with an accumulated benefit obligation in excess of plan assets $ 4,183.7 $ 4,210.2
Accumulated benefit obligation for defined benefit plans with an accumulated benefit obligation in excess of plan assets 4,149.3 4,136.5
Fair value of plan assets for defined benefit plans with an accumulated benefit obligation in excess of plan assets $ 3,550.1 3,373.5
Other postretirement benefits    
Information for Defined Benefit Plans With an Accumulated Benefit Obligation in Excess of Plan Assets    
Accumulated benefit obligation for defined benefit plans with an accumulated benefit obligation in excess of plan assets   $ 2.9