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BENEFIT PLANS: (Details)
$ in Millions
 6 Months Ended
Jun. 30, 2024
USD ($)
plan
Jun. 30, 2023
USD ($)
Benefit plans    
Number of noncontributory defined benefit pension plans | plan 2  
Post retirement defined benefit plans and defined contribution plan    
Defined benefit plan, net periodic benefit costs    
Service cost $ 1.3 $ 1.0
Interest cost 2.0 1.7
Expected return on plan assets (3.2) (2.7)
Amortization of prior service cost / (credit) 0.2 0.2
Net periodic benefit cost 0.3 0.2
Post-retirement health care plans    
Defined benefit plan, net periodic benefit costs    
Interest cost 1.1 1.0
Net periodic benefit cost $ 1.1 $ 1.0