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Employee and Agent Benefits - Benefit Obligation and Funded Status (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Pension benefits      
Change in benefit obligation      
Benefit obligation at beginning of year $ (4,210.2) $ (3,692.1)  
Service cost (83.2) (72.7) $ (66.0)
Interest cost (103.3) (117.3) (126.5)
Actuarial gain (loss) 75.8 (462.4)  
Benefits paid 137.2 134.3  
Benefit obligation at end of year (4,183.7) (4,210.2) (3,692.1)
Change in plan assets      
Fair value of plan assets at beginning of year 3,373.5 2,926.0  
Actual return on plan assets 208.7 521.3  
Employer contribution 105.1 60.5  
Benefits paid (137.2) (134.3)  
Fair value of plan assets at end of year 3,550.1 3,373.5 2,926.0
Amount recognized in statement of financial position      
Amount recognized in other liabilities (633.6) (836.7)  
Total assets (liabilities) recognized in statement of financial position (633.6) (836.7)  
Amount recognized in accumulated other comprehensive (income) loss      
Total net actuarial (gain) loss 588.0 760.0  
Prior service (benefit) cost (104.2) (121.0)  
Pre-tax accumulated other comprehensive (income) loss 483.8 639.0  
Additional defined benefit plan disclosures      
Accumulated benefit obligation 4,149.3 4,136.5  
Market value of assets held in Rabbi trusts for benefit of nonqualified pension plan participants 386.3 394.8  
Other postretirement benefits      
Change in benefit obligation      
Benefit obligation at beginning of year (108.0) (101.4)  
Interest cost (2.2) (2.8) (3.7)
Actuarial gain (loss) 7.6 (11.7)  
Participant contributions (6.1) (6.0)  
Benefits paid 13.5 12.8  
Plan amendments   1.0  
Other changes in benefit obligation (0.1) 0.1  
Benefit obligation at end of year (95.3) (108.0) (101.4)
Change in plan assets      
Fair value of plan assets at beginning of year 780.6 732.8  
Actual return on plan assets 1.6 53.1  
Employer contribution 1.5 1.5  
Participant contributions 6.1 6.0  
Benefits paid (13.5) (12.8)  
Assets re-designated for non-retiree benefits 656.5    
Fair value of plan assets at end of year 119.8 780.6 $ 732.8
Amount recognized in statement of financial position      
Amount recognized in other assets 24.5 675.5  
Amount recognized in other liabilities   (2.9)  
Total assets (liabilities) recognized in statement of financial position 24.5 672.6  
Amount recognized in accumulated other comprehensive (income) loss      
Total net actuarial (gain) loss (26.7) (22.8)  
Prior service (benefit) cost (6.2) (7.3)  
Pre-tax accumulated other comprehensive (income) loss $ (32.9) $ (30.1)