v3.26.1
PENSION PLANS AND RETIREMENT BENEFITS (Tables)
 6 Months Ended
Jun. 30, 2026
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit (Income) Cost
Pension BenefitsOther Postretirement Benefits
Three Months Ended June 30,Three Months Ended June 30,
2026202520262025
Components of Net Periodic Benefit (Income) Cost($ in millions)
Service cost$1.0 $1.2 $0.1 $0.2 
Interest cost23.4 24.9 0.3 0.4 
Expected return on plans’ assets(30.0)(31.7)— — 
Amortization of prior service cost(0.1)(0.1)0.1 (0.1)
Recognized actuarial loss3.5 1.6 0.2 0.1 
Net periodic benefit (income) cost$(2.2)$(4.1)$0.7 $0.6 
Pension BenefitsOther Postretirement Benefits
Six Months Ended June 30,Six Months Ended June 30,
2026202520262025
Components of Net Periodic Benefit (Income) Cost($ in millions)
Service cost$2.0 $2.2 $0.3 $0.3 
Interest cost46.1 49.4 0.7 0.7 
Expected return on plans’ assets(59.8)(63.4)— — 
Amortization of prior service cost(0.3)(0.3)0.1 (0.2)
Recognized actuarial loss6.8 3.0 0.3 0.2 
Net periodic benefit (income) cost$(5.2)$(9.1)$1.4 $1.0