v3.26.3
PENSION PLANS AND RETIREMENT BENEFITS (Tables)
 9 Months Ended
Sep. 30, 2026
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit (Income) Cost
Pension BenefitsOther Postretirement Benefits
Three Months Ended September 30,Three Months Ended September 30,
2026202520262025
Components of Net Periodic Benefit (Income) Cost($ in millions)
Service cost$1.0 $1.3 $0.2 $0.1 
Interest cost22.8 24.9 0.3 0.4 
Expected return on plans’ assets(29.7)(31.7)— — 
Amortization of prior service cost(0.2)(0.2)— 0.3 
Recognized actuarial loss3.5 1.4 — — 
Net periodic benefit (income) cost$(2.6)$(4.3)$0.5 $0.8 
Pension BenefitsOther Postretirement Benefits
Nine Months Ended September 30,Nine Months Ended September 30,
2026202520262025
Components of Net Periodic Benefit (Income) Cost($ in millions)
Service cost$3.0 $3.5 $0.5 $0.4 
Interest cost68.9 74.3 1.0 1.1 
Expected return on plans’ assets(89.5)(95.1)— — 
Amortization of prior service cost(0.5)(0.5)0.1 0.1 
Recognized actuarial loss10.3 4.4 0.3 0.2 
Net periodic benefit (income) cost$(7.8)$(13.4)$1.9 $1.8