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Employee and Agent Benefits - Benefit Obligation and Funded Status (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Pension benefits      
Change in benefit obligation      
Benefit obligation at beginning of year $ (4,183.7) $ (4,210.2)  
Service cost (78.4) (83.2) $ (72.7)
Interest cost (112.8) (103.3) (117.3)
Actuarial gain (loss) 1,023.5 75.8  
Benefits paid 142.0 137.2  
Benefit obligation at end of year (3,209.4) (4,183.7) (4,210.2)
Change in plan assets      
Fair value of plan assets at beginning of year 3,550.1 3,373.5  
Actual return on plan assets (754.3) 208.7  
Employer contribution 72.5 105.1  
Benefits paid (142.0) (137.2)  
Fair value of plan assets at end of year 2,726.3 3,550.1 3,373.5
Amount recognized in statement of financial position      
Amount recognized in other liabilities (483.1) (633.6)  
Total assets (liabilities) recognized in statement of financial position (483.1) (633.6)  
Amount recognized in accumulated other comprehensive (income) loss      
Total net actuarial (gain) loss 442.0 588.0  
Prior service (benefit) cost (87.4) (104.2)  
Pre-tax accumulated other comprehensive (income) loss 354.6 483.8  
Additional defined benefit plan disclosures      
Accumulated benefit obligation 3,209.4 4,149.3  
Market value of assets held in Rabbi trusts for benefit of nonqualified pension plan participants 336.7 386.3  
Other postretirement benefits      
Change in benefit obligation      
Benefit obligation at beginning of year (95.3) (108.0)  
Interest cost (2.3) (2.2) (2.8)
Actuarial gain (loss) 19.5 7.6  
Participant contributions (6.4) (6.1)  
Benefits paid 13.5 13.5  
Other changes in benefit obligation   (0.1)  
Benefit obligation at end of year (71.0) (95.3) (108.0)
Change in plan assets      
Fair value of plan assets at beginning of year 119.8 780.6  
Actual return on plan assets (20.0) 1.6  
Employer contribution 1.7 1.5  
Participant contributions 6.4 6.1  
Benefits paid (13.5) (13.5)  
Assets re-designated for non-retiree benefits   656.5  
Fair value of plan assets at end of year 94.4 119.8 $ 780.6
Amount recognized in statement of financial position      
Amount recognized in other assets 23.4 24.5  
Total assets (liabilities) recognized in statement of financial position 23.4 24.5  
Amount recognized in accumulated other comprehensive (income) loss      
Total net actuarial (gain) loss (20.2) (26.7)  
Prior service (benefit) cost (5.1) (6.2)  
Pre-tax accumulated other comprehensive (income) loss $ (25.3) $ (32.9)