v3.26.1
PENSION PLANS AND RETIREMENT BENEFITS (Details 1) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Defined Benefit Plan, Plan Assets, Contributions by Employer, Qualified Plan     $ 0.6  
Pension Benefits        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost $ 1.0 $ 1.2 2.0 $ 2.2
Interest cost 23.4 24.9 46.1 49.4
Expected return on plans’ assets 30.0 31.7 59.8 63.4
Amortization of prior service cost (0.1) (0.1) (0.3) (0.3)
Recognized actuarial loss (3.5) (1.6) (6.8) (3.0)
Net periodic benefit (income) cost (2.2) (4.1) (5.2) (9.1)
Other Postretirement Benefits        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 0.1 0.2 0.3 0.3
Interest cost 0.3 0.4 0.7 0.7
Expected return on plans’ assets 0.0 0.0 0.0 0.0
Amortization of prior service cost 0.1 (0.1) 0.1 (0.2)
Recognized actuarial loss (0.2) (0.1) (0.3) (0.2)
Net periodic benefit (income) cost $ 0.7 $ 0.6 $ 1.4 $ 1.0