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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