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v3.26.1

Retirement and Other Employee Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2026 | Mar. 31, 2025
Pension Plan | Qualified Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Interest cost | $ 5.6 | $ 6.3
Expected return on plan assets | (9.0) | (9.7)
Amortization of net loss | 0.4 | 0.0
Settlement loss | 0.0 | 0.0
Net periodic benefit cost | (3.0) | (3.4)
Pension Plan | Unfunded Non-qualified Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Interest cost | 0.5 | 0.6
Expected return on plan assets | 0.0 | 0.0
Amortization of net loss | 0.3 | 0.3
Settlement loss | 0.0 | 0.0
Net periodic benefit cost | 0.8 | 0.9
Plan Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Interest cost | 0.0 | 0.0
Expected return on plan assets | 0.0 | 0.0
Amortization of net loss | 0.0 | 0.0
Settlement loss | 0.0 | 2.5
Net periodic benefit cost | $ 0.0 | $ 2.5

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