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BENEFIT PLANS: (Details) (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
BENEFIT PLANS:    
Number of Peruvian noncontributory defined benefit pension plans 2  
Post retirement defined benefit plans
    
Defined benefit plan, net periodic benefit cost    
Interest cost $ 0.8 $ 0.9
Service cost 1.0 0.7
Expected return on plan assets (2.5) (2.7)
Amortization of net loss (gain) 0.1 0.1
Amortization of net actuarial loss (0.6) (0.6)
Net periodic benefit cost (1.2) (1.6)
Post-retirement health care plan
    
Defined benefit plan, net periodic benefit cost    
Interest cost 1.2 1.1
Amortization of net loss (gain)   (0.2)
Net periodic benefit cost $ 1.2 $ 0.9