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PENSION PLANS AND RETIREMENT BENEFITS (Tables)
3 Months Ended
Mar. 31, 2022
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit (Income) Cost
Pension BenefitsOther Postretirement Benefits
 Three Months Ended March 31,Three Months Ended March 31,
2022202120222021
Components of Net Periodic Benefit (Income) Cost($ in millions)
Service cost$2.3 $3.0 $0.3 $0.4 
Interest cost15.4 12.8 0.3 0.3 
Expected return on plans’ assets(34.2)(36.1)— — 
Amortization of prior service cost(0.2)(0.1)— — 
Recognized actuarial loss8.6 13.1 0.5 0.7 
Net periodic benefit (income) cost$(8.1)$(7.3)$1.1 $1.4