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Employee and Agent Benefits - Supplemental Information, Qualified and Nonqualified Plans (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Pension benefits      
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  
Accumulated benefit obligation 3,209.4 4,149.3  
Defined Benefit Plan Nonqualified Pension Plan Market Value Of Assets Held In Trust 336.7 386.3  
Components of Net Periodic Benefit Cost (Income)      
Service cost 78.4 83.2 $ 72.7
Interest cost 112.8 103.3 117.3
Expected return on plan assets (178.9) (182.7) (156.8)
Amortization of prior service (benefit) cost (16.8) (16.8) (16.8)
Recognized net actuarial (gain) loss 55.7 70.2 75.4
Net periodic benefit cost (income) 51.2 57.2 91.8
Other changes recognized in accumulated other comprehensive (income) loss      
Net actuarial (gain) loss (90.3) (101.8)  
Amortization of gain (loss) (55.7) (70.2)  
Amortization of prior service benefit (cost) 16.8 16.8  
Total recognized in pre-tax accumulated other comprehensive (income) loss (129.2) (155.2)  
Total recognized in net periodic benefit cost and pre-tax accumulated other comprehensive (income) loss (78.0) (98.0)  
Pension benefits | Qualified benefit plans      
Amount recognized in statement of financial position      
Amount recognized in other liabilities (70.7) (108.4)  
Total assets (liabilities) recognized in statement of financial position (70.7) (108.4)  
Amount recognized in accumulated other comprehensive (income) loss      
Total net actuarial (gain) loss 390.7 415.5  
Prior service (benefit) cost (72.6) (85.2)  
Pre-tax accumulated other comprehensive (income) loss 318.1 330.3  
Components of Net Periodic Benefit Cost (Income)      
Service cost 72.5 76.2  
Interest cost 98.7 90.1  
Expected return on plan assets (178.9) (182.7)  
Amortization of prior service (benefit) cost (12.6) (12.6)  
Recognized net actuarial (gain) loss 39.7 52.8  
Net periodic benefit cost (income) 19.4 23.8  
Other changes recognized in accumulated other comprehensive (income) loss      
Net actuarial (gain) loss 15.0 (95.3)  
Amortization of gain (loss) (39.7) (52.8)  
Amortization of prior service benefit (cost) 12.6 12.6  
Total recognized in pre-tax accumulated other comprehensive (income) loss (12.1) (135.5)  
Total recognized in net periodic benefit cost and pre-tax accumulated other comprehensive (income) loss 7.3 (111.7)  
Pension benefits | Nonqualified benefit plans      
Amount recognized in statement of financial position      
Amount recognized in other liabilities (412.4) (525.2)  
Total assets (liabilities) recognized in statement of financial position (412.4) (525.2)  
Amount recognized in accumulated other comprehensive (income) loss      
Total net actuarial (gain) loss 51.3 172.5  
Prior service (benefit) cost (14.8) (19.0)  
Pre-tax accumulated other comprehensive (income) loss 36.5 153.5  
Components of Net Periodic Benefit Cost (Income)      
Service cost 5.9 7.0  
Interest cost 14.1 13.2  
Amortization of prior service (benefit) cost (4.2) (4.2)  
Recognized net actuarial (gain) loss 16.0 17.4  
Net periodic benefit cost (income) 31.8 33.4  
Other changes recognized in accumulated other comprehensive (income) loss      
Net actuarial (gain) loss (105.3) (6.5)  
Amortization of gain (loss) (16.0) (17.4)  
Amortization of prior service benefit (cost) 4.2 4.2  
Total recognized in pre-tax accumulated other comprehensive (income) loss (117.1) (19.7)  
Total recognized in net periodic benefit cost and pre-tax accumulated other comprehensive (income) loss (85.3) 13.7  
Other postretirement benefits      
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)  
Components of Net Periodic Benefit Cost (Income)      
Interest cost 2.3 2.2 2.8
Expected return on plan assets (4.9) (4.8) (36.0)
Amortization of prior service (benefit) cost (1.1) (1.1) (1.0)
Recognized net actuarial (gain) loss (1.1) (0.5)  
Net periodic benefit cost (income) (4.8) (4.2) $ (34.2)
Other changes recognized in accumulated other comprehensive (income) loss      
Net actuarial (gain) loss 5.4 (4.4)  
Amortization of gain (loss) 1.1 0.5  
Amortization of prior service benefit (cost) 1.1 1.1  
Total recognized in pre-tax accumulated other comprehensive (income) loss 7.6 (2.8)  
Total recognized in net periodic benefit cost and pre-tax accumulated other comprehensive (income) loss $ 2.8 $ (7.0)