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BENEFIT PLANS: (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2022
USD ($)
plan
Mar. 31, 2021
USD ($)
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 $ 0.4 $ 0.4
Interest cost 0.5 0.3
Expected return on plan assets (1.0) (0.8)
Amortization of net loss/(gain) 0.1 0.1
Post-retirement Health care plans    
Defined benefit plan, net periodic benefit costs    
Interest cost 0.4 0.4
Amortization of prior service cost / (credit)   0.1
Net periodic benefit cost $ 0.4 $ 0.5