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PENSION PLANS AND RETIREMENT BENEFITS (Tables)
 6 Months Ended
Jun. 30, 2024
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit (Income) Cost
Pension BenefitsOther Postretirement Benefits
 Three Months Ended June 30,Three Months Ended June 30,
2024202320242023
Components of Net Periodic Benefit (Income) Cost($ in millions)
Service cost$1.2 $1.4 $0.2 $0.2 
Interest cost25.5 26.4 0.5 0.4 
Expected return on plans’ assets(33.8)(32.7)— — 
Amortization of prior service cost(0.2)(0.1)— 0.1 
Recognized actuarial loss1.8 0.3 0.3 0.2 
Net periodic benefit (income) cost$(5.5)$(4.7)$1.0 $0.9 
Pension BenefitsOther Postretirement Benefits
 Six Months Ended June 30,Six Months Ended June 30,
2024202320242023
Components of Net Periodic Benefit (Income) Cost($ in millions)
Service cost$2.5 $2.8 $0.4 $0.4 
Interest cost50.6 52.7 0.9 0.9 
Expected return on plans’ assets(67.7)(65.6)— — 
Amortization of prior service cost(0.3)(0.2)— 0.1 
Recognized actuarial loss3.3 0.6 0.5 0.4 
Net periodic benefit (income) cost$(11.6)$(9.7)$1.8 $1.8