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Employee and Agent Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Pension benefits    
Components of Net Periodic Benefit Cost (Income)    
Employer contribution $ 22.4  
Pension benefits | Maximum    
Components of Net Periodic Benefit Cost (Income)    
Amount of possible contributions to be made during the current fiscal year to the qualified and nonqualified pension plans combined 75.0  
Pension benefits | Operating Expenses    
Components of Net Periodic Benefit Cost (Income)    
Service cost 20.2 $ 20.8
Interest cost 28.1 25.8
Expected return on plan assets (44.7) (45.7)
Amortization of prior service (benefit) cost (4.2) (4.2)
Recognized net actuarial (gain) loss 13.8 17.6
Net periodic benefit cost (income) 13.2 14.3
Other postretirement benefits | Operating Expenses    
Components of Net Periodic Benefit Cost (Income)    
Interest cost 0.6 0.5
Expected return on plan assets (1.2) (1.1)
Amortization of prior service (benefit) cost (0.3) (0.3)
Recognized net actuarial (gain) loss (0.3) (0.1)
Net periodic benefit cost (income) $ (1.2) $ (1.0)