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BENEFIT PLANS: (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2015
USD ($)
plan
Sep. 30, 2014
USD ($)
BENEFIT PLANS:    
Number of expatriate noncontributory defined benefit pension plans | plan 2  
Post retirement defined benefit plans    
Defined benefit plan, net periodic benefit cost    
Service cost $ 0.7 $ 0.9
Interest cost 0.7 0.9
Expected return on plan assets (2.4) (2.7)
Amortization of net actuarial loss (0.3) (0.3)
Amortization of net loss (gain) 0.3 0.1
Net periodic benefit cost (1.0) (1.1)
Post-retirement Health Care Plan    
Defined benefit plan, net periodic benefit cost    
Interest cost 1.0 1.0
Amortization of net loss (gain) (0.2) (0.2)
Net periodic benefit cost 0.8 0.8
Post-retirement Health Care Plan | Maximum    
Defined benefit plan, net periodic benefit cost    
Amortization of prior service cost (credit) $ 0.1 $ 0.1