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Employee and Agent Benefits - Supplemental Information, Qualified and Nonqualified Plans (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Pension benefits |  |  |
Amount recognized in statement of financial position |  |  |
Amount recognized in other liabilities | $ (481.3) | $ (483.1) |
Total assets (liabilities) recognized in statement of financial position | (481.3) | (483.1) |
Amount recognized in accumulated other comprehensive (income) loss |  |  |
Total net actuarial (gain) loss | 425.4 | 442.0 |
Prior service (benefit) cost | (70.6) | (87.4) |
Pre-tax accumulated other comprehensive (income) loss | 354.8 | 354.6 |
Accumulated benefit obligation | 3,390.9 | 3,209.4 |
Defined Benefit Plan Nonqualified Pension Plan Market Value Of Assets Held In Trust | 342.2 | 336.7 |
Components of Net Periodic Benefit Cost (Income) |  |  |
Service cost | 55.6 | 78.4 | $ 83.2
Interest cost | 160.1 | 112.8 | 103.3
Expected return on plan assets | (163.2) | (178.9) | (182.7)
Amortization of prior service (benefit) cost | (16.8) | (16.8) | (16.8)
Recognized net actuarial (gain) loss | 41.0 | 55.7 | 70.2
Net periodic benefit cost (income) | 76.7 | 51.2 | 57.2
Other changes recognized in accumulated other comprehensive (income) loss |  |  |
Net actuarial (gain) loss | 24.4 | (90.3) |
Amortization of gain (loss) | (41.0) | (55.7) |
Amortization of prior service benefit (cost) | 16.8 | 16.8 |
Total recognized in pre-tax accumulated other comprehensive (income) loss | 0.2 | (129.2) |
Total recognized in net periodic benefit cost and pre-tax accumulated other comprehensive (income) loss | 76.9 | (78.0) |
Pension benefits | Qualified benefit plans |  |  |
Amount recognized in statement of financial position |  |  |
Amount recognized in other liabilities | (58.3) | (70.7) |
Total assets (liabilities) recognized in statement of financial position | (58.3) | (70.7) |
Amount recognized in accumulated other comprehensive (income) loss |  |  |
Total net actuarial (gain) loss | 361.4 | 390.7 |
Prior service (benefit) cost | (60.0) | (72.6) |
Pre-tax accumulated other comprehensive (income) loss | 301.4 | 318.1 |
Components of Net Periodic Benefit Cost (Income) |  |  |
Service cost | 51.6 | 72.5 |
Interest cost | 139.7 | 98.7 |
Expected return on plan assets | (163.2) | (178.9) |
Amortization of prior service (benefit) cost | (12.6) | (12.6) |
Recognized net actuarial (gain) loss | 38.8 | 39.7 |
Net periodic benefit cost (income) | 54.3 | 19.4 |
Other changes recognized in accumulated other comprehensive (income) loss |  |  |
Net actuarial (gain) loss | 9.5 | 15.0 |
Amortization of gain (loss) | (38.8) | (39.7) |
Amortization of prior service benefit (cost) | 12.6 | 12.6 |
Total recognized in pre-tax accumulated other comprehensive (income) loss | (16.7) | (12.1) |
Total recognized in net periodic benefit cost and pre-tax accumulated other comprehensive (income) loss | 37.6 | 7.3 |
Pension benefits | Nonqualified benefit plans |  |  |
Amount recognized in statement of financial position |  |  |
Amount recognized in other liabilities | (423.0) | (412.4) |
Total assets (liabilities) recognized in statement of financial position | (423.0) | (412.4) |
Amount recognized in accumulated other comprehensive (income) loss |  |  |
Total net actuarial (gain) loss | 64.0 | 51.3 |
Prior service (benefit) cost | (10.6) | (14.8) |
Pre-tax accumulated other comprehensive (income) loss | 53.4 | 36.5 |
Components of Net Periodic Benefit Cost (Income) |  |  |
Service cost | 4.0 | 5.9 |
Interest cost | 20.4 | 14.1 |
Amortization of prior service (benefit) cost | (4.2) | (4.2) |
Recognized net actuarial (gain) loss | 2.2 | 16.0 |
Net periodic benefit cost (income) | 22.4 | 31.8 |
Other changes recognized in accumulated other comprehensive (income) loss |  |  |
Net actuarial (gain) loss | 14.9 | (105.3) |
Amortization of gain (loss) | (2.2) | (16.0) |
Amortization of prior service benefit (cost) | 4.2 | 4.2 |
Total recognized in pre-tax accumulated other comprehensive (income) loss | 16.9 | (117.1) |
Total recognized in net periodic benefit cost and pre-tax accumulated other comprehensive (income) loss | 39.3 | (85.3) |
Other postretirement benefits |  |  |
Amount recognized in statement of financial position |  |  |
Amount recognized in other assets | 31.4 | 23.4 |
Total assets (liabilities) recognized in statement of financial position | 31.4 | 23.4 |
Amount recognized in accumulated other comprehensive (income) loss |  |  |
Total net actuarial (gain) loss | (24.4) | (20.2) |
Prior service (benefit) cost | (4.3) | (5.1) |
Pre-tax accumulated other comprehensive (income) loss | (28.7) | (25.3) |
Components of Net Periodic Benefit Cost (Income) |  |  |
Interest cost | 3.4 | 2.3 | 2.2
Expected return on plan assets | (4.6) | (4.9) | (4.8)
Amortization of prior service (benefit) cost | (0.8) | (1.1) | (1.1)
Recognized net actuarial (gain) loss | (1.0) | (1.1) | (0.5)
Net periodic benefit cost (income) | (3.0) | (4.8) | $ (4.2)
Other changes recognized in accumulated other comprehensive (income) loss |  |  |
Net actuarial (gain) loss | (5.2) | 5.4 |
Amortization of gain (loss) | 1.0 | 1.1 |
Amortization of prior service benefit (cost) | 0.8 | 1.1 |
Total recognized in pre-tax accumulated other comprehensive (income) loss | (3.4) | 7.6 |
Total recognized in net periodic benefit cost and pre-tax accumulated other comprehensive (income) loss | $ (6.4) | $ 2.8 |

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- Definition The fair value of assets held in Rabbi trusts for the benefit of nonqualified pension plan participants. The assets held in the Rabbi trust are available to satisfy the claims of general creditors only in the event of bankruptcy. Therefore, they are fully consolidated in the consolidated statement of financial position and are not reflected in funded status as they do not qualify as plan assets. + References No definition available. + Details
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