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BENEFIT PLANS: (Details)
$ in Millions
 6 Months Ended
Jun. 30, 2017
USD ($)
plan
Jun. 30, 2016
USD ($)
Benefit plans    
Number of noncontributory defined benefit pension plans | plan 2  
Post retirement defined benefit plans    
Defined benefit plan, net periodic benefit costs    
Service cost $ 0.4 $ 0.4
Interest cost 0.7 0.5
Expected return on plan assets (1.4) (1.3)
Amortization of prior service cost (credit) 0.1 0.1
Amortization of net loss/(gain) 0.1 0.1
Net periodic benefit costs (0.1) (0.2)
Post-retirement Health care plans    
Defined benefit plan, net periodic benefit costs    
Interest cost 0.5 0.3
Amortization of net loss/(gain) (0.1) (0.2)
Net periodic benefit costs 0.4 0.1
Post-retirement Health care plans | Maximum    
Defined benefit plan, net periodic benefit costs    
Amortization of prior service cost (credit) $ 0.1 $ 0.1