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Employee and Agent Benefits - Net Periodic Benefit Cost (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Plan actuarial gain and loss amortization disclosures |  |  |
Allowable corridor not used for amortization of actuarial gains and losses of qualified pension plan (as a percent) | 10.00% |  |
Pension benefits |  |  |
Components of Net Periodic Benefit Cost (Income) |  |  |
Service cost | $ 55.6 | $ 78.4 | $ 83.2
Interest cost | $ 160.1 | $ 112.8 | $ 103.3
Interest cost, location on consolidated statements of operations | Operating expenses | Operating expenses | Operating expenses
Expected return on plan assets | $ (163.2) | $ (178.9) | $ (182.7)
Expected return on plan assets, location on consolidated statements of operations | Operating expenses | Operating expenses | Operating expenses
Amortization of prior service (benefit) cost | $ (16.8) | $ (16.8) | $ (16.8)
Amortization of prior service (benefit) cost, location on consolidated statements of operations | Operating expenses | Operating expenses | Operating expenses
Recognized net actuarial (gain) loss | $ 41.0 | $ 55.7 | $ 70.2
Recognized net actuarial (gain) loss, location on consolidated statements of operations | Operating expenses | Operating expenses | Operating expenses
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) |
Other postretirement benefits |  |  |
Components of Net Periodic Benefit Cost (Income) |  |  |
Interest cost | $ 3.4 | $ 2.3 | $ 2.2
Interest cost, location on consolidated statements of operations | Operating expenses | Operating expenses | Operating expenses
Expected return on plan assets | $ (4.6) | $ (4.9) | $ (4.8)
Expected return on plan assets, location on consolidated statements of operations | Operating expenses | Operating expenses | Operating expenses
Amortization of prior service (benefit) cost | $ (0.8) | $ (1.1) | $ (1.1)
Amortization of prior service (benefit) cost, location on consolidated statements of operations | Operating expenses | Operating expenses | Operating expenses
Recognized net actuarial (gain) loss | $ (1.0) | $ (1.1) | $ (0.5)
Recognized net actuarial (gain) loss, location on consolidated statements of operations | Operating expenses | Operating expenses | Operating expenses
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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