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BENEFIT PLANS: (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2023
USD ($)
plan
Mar. 31, 2022
USD ($)
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 $ 0.5 $ 0.4
Interest cost 0.8 0.5
Expected return on plan assets (1.3) (1.0)
Amortization of net loss (gain) 0.1 0.1
Net periodic benefit cost 0.1  
Post-retirement Health care plans    
Defined benefit plan, net periodic benefit costs    
Interest cost 0.5 0.4
Net periodic benefit cost $ 0.5 $ 0.4