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BENEFIT PLANS: (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2023
USD ($)
plan
Sep. 30, 2022
USD ($)
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 $ 1.6 $ 1.3
Interest cost 2.6 1.7
Expected return on plan assets (4.2) (2.9)
Amortization of prior service cost / (credit) 0.1 0.1
Amortization of net loss (gain) 0.3 0.3
Net periodic benefit cost 0.4 0.5
Post-retirement Health care plans    
Defined benefit plan, net periodic benefit costs    
Interest cost 1.6 1.2
Amortization of net loss (gain)   0.1
Net periodic benefit cost $ 1.6 1.3
Post-retirement Health care plans | Maximum    
Defined benefit plan, net periodic benefit costs    
Amortization of prior service cost / (credit)   $ 0.1