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Employee and Agent Benefits - Supplemental Information, Qualified and Nonqualified Plans (Details) - Pension benefits - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Amount recognized in statement of financial position      
Amount recognized in other liabilities $ (432.2) $ (481.3)  
Total assets (liabilities) recognized in statement of financial position (432.2) (481.3)  
Amount recognized in accumulated other comprehensive (income) loss      
Total net actuarial (gain) loss 371.7 425.4  
Prior service (benefit) cost (53.9) (70.6)  
Pre-tax accumulated other comprehensive (income) loss 317.8 354.8  
Components of Net Periodic Benefit Cost (Income)      
Service cost 59.2 55.6 $ 78.4
Interest cost 161.5 160.1 112.8
Expected return on plan assets (170.4) (163.2) (178.9)
Amortization of prior service (benefit) cost (16.7) (16.8) (16.8)
Recognized net actuarial (gain) loss 39.0 41.0 55.7
Settlement 0.2    
Net periodic benefit cost (income) 72.8 76.7 $ 51.2
Other changes recognized in accumulated other comprehensive (income) loss      
Net actuarial (gain) loss (14.5) 24.4  
Amortization of gain (loss) (39.0) (41.0)  
Amortization of prior service benefit (cost) 16.7 16.8  
Settlement (0.2)    
Total recognized in pre-tax accumulated other comprehensive (income) loss (37.0) 0.2  
Total recognized in net periodic benefit cost and pre-tax accumulated other comprehensive (income) loss 35.8 76.9  
Qualified benefit plans      
Amount recognized in statement of financial position      
Amount recognized in other liabilities (34.9) (58.3)  
Total assets (liabilities) recognized in statement of financial position (34.9) (58.3)  
Amount recognized in accumulated other comprehensive (income) loss      
Total net actuarial (gain) loss 331.0 361.4  
Prior service (benefit) cost (47.4) (60.0)  
Pre-tax accumulated other comprehensive (income) loss 283.6 301.4  
Components of Net Periodic Benefit Cost (Income)      
Service cost 55.2 51.6  
Interest cost 141.6 139.7  
Expected return on plan assets (170.4) (163.2)  
Amortization of prior service (benefit) cost (12.7) (12.6)  
Recognized net actuarial (gain) loss 35.5 38.8  
Settlement 0.2    
Net periodic benefit cost (income) 49.4 54.3  
Other changes recognized in accumulated other comprehensive (income) loss      
Net actuarial (gain) loss 5.2 9.5  
Amortization of gain (loss) (35.4) (38.8)  
Amortization of prior service benefit (cost) 12.7 12.6  
Settlement (0.2)    
Total recognized in pre-tax accumulated other comprehensive (income) loss (17.7) (16.7)  
Total recognized in net periodic benefit cost and pre-tax accumulated other comprehensive (income) loss 31.7 37.6  
Nonqualified benefit plans      
Amount recognized in statement of financial position      
Amount recognized in other liabilities (397.3) (423.0)  
Total assets (liabilities) recognized in statement of financial position (397.3) (423.0)  
Amount recognized in accumulated other comprehensive (income) loss      
Total net actuarial (gain) loss 40.7 64.0  
Prior service (benefit) cost (6.5) (10.6)  
Pre-tax accumulated other comprehensive (income) loss 34.2 53.4  
Components of Net Periodic Benefit Cost (Income)      
Service cost 4.0 4.0  
Interest cost 19.9 20.4  
Amortization of prior service (benefit) cost (4.0) (4.2)  
Recognized net actuarial (gain) loss 3.5 2.2  
Net periodic benefit cost (income) 23.4 22.4  
Other changes recognized in accumulated other comprehensive (income) loss      
Net actuarial (gain) loss (19.7) 14.9  
Amortization of gain (loss) (3.6) (2.2)  
Amortization of prior service benefit (cost) 4.0 4.2  
Total recognized in pre-tax accumulated other comprehensive (income) loss (19.3) 16.9  
Total recognized in net periodic benefit cost and pre-tax accumulated other comprehensive (income) loss $ 4.1 $ 39.3