v3.26.3
Pension Plans and Postretirement Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 5,100 $ 5,200 $ 15,500 $ 10,300
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 4,578 4,446 13,867 9,026
Interest cost 16,437 16,759 49,581 41,994
Expected return on plan assets (21,883) (20,796) (65,986) (51,787)
Amortization of prior service cost 955 792 2,867 2,375
Net periodic benefit loss 87 1,201 329 1,608
Other Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 532 764 1,620 1,233
Interest cost 947 1,294 2,868 2,695
Expected return on plan assets (480) (486) (1,440) (1,459)
Amortization of prior service cost 22 22 66 66
Net periodic benefit loss $ 1,021 $ 1,594 $ 3,114 $ 2,535