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Employee and Agent Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Pension benefits |  |
Components of Net Periodic Benefit Cost (Income) |  |
Service cost | $ 14.7 | $ 14.8
Interest cost | $ 43.1 | $ 40.3
Interest cost, location on consolidated statements of operations | Operating expenses | Operating expenses
Expected return on plan assets | $ (42.9) | $ (42.6)
Expected return on plan assets, location on consolidated statements of operations | Operating expenses | Operating expenses
Amortization of prior service (benefit) cost | $ (3.8) | $ (4.2)
Amortization of prior service (benefit) cost, location on consolidated statements of operations | Operating expenses | Operating expenses
Recognized net actuarial (gain) loss | $ 8.3 | $ 9.6
Recognized net actuarial (gain) loss, location on consolidated statements of operations | Operating expenses | Operating expenses
Net periodic benefit cost (income) | $ 19.4 | $ 17.9
Contributions made by employer to fund qualified and nonqualified pension plans | 0.0 |
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 | 70.0 |
Other postretirement benefits |  |
Components of Net Periodic Benefit Cost (Income) |  |
Interest cost | $ 0.8 | $ 0.8
Interest cost, location on consolidated statements of operations | Operating expenses | Operating expenses
Expected return on plan assets | $ (1.1) | $ (1.1)
Expected return on plan assets, location on consolidated statements of operations | Operating expenses | Operating expenses
Amortization of prior service (benefit) cost | $ (0.3) | $ (0.3)
Amortization of prior service (benefit) cost, location on consolidated statements of operations | Operating expenses | Operating expenses
Recognized net actuarial (gain) loss | $ (0.4) | $ (0.3)
Recognized net actuarial (gain) loss, location on consolidated statements of operations | Operating expenses | Operating expenses
Net periodic benefit cost (income) | $ (1.0) | $ (0.9)

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