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BENEFIT PLANS: (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
BENEFIT PLANS:      
Number of Peruvian noncontributory defined benefit pension plans 2    
Post retirement defined benefit plan
      
Defined benefit plan, net periodic benefit cost      
Service cost $ 1.0 $ 0.9 $ 2.1
Interest cost 1.1 1.2 2.2
Expected return on plan assets (3.6) (3.5) (3.7)
Amortization of transition assets, net   (0.1)  
Amortization of net actuarial loss (0.8) (1.3) (1.0)
Amortization of net loss/(gain) 0.1 0.1 0.1
Amortization of prior services cost/ (credit)     0.2
Settlement/curtailment     (19.0)
Net periodic benefit costs (2.2) (2.7) (19.1)
Change in benefit obligation:      
Projected benefit obligation at beginning of year 25.2 25.2  
Service cost 1.0 0.9 2.1
Interest cost 1.1 1.2 2.2
Actuarial gain census (0.1) 0.2  
Benefits paid (2.0) (1.9)  
Actuarial (gain)/loss 1.0 (0.4)  
Actuarial gain assumption changes 0.8 1.3  
Inflation adjustment 0.9 (1.3)  
Projected benefit obligation at end of year 27.9 25.2 25.2
Change in plan assets:      
Fair value of plan assets at beginning of year 55.8 62.9  
Actual return on plan assets 4.9    
Employer contributions (0.6) (0.5)  
Benefits paid (1.1) (1.2)  
Currency exchange rate adjustment 2.9 (5.4)  
Fair value of plan assets at end of year 61.9 55.8 62.9
Funded status at end of year 34.0 30.6  
Amounts recognized in statement of financial position      
Non-current assets 34.0 30.6  
Total 34.0 30.6  
Amounts recognized in accumulated other comprehensive income      
Net loss (gain) (3.6) (3.9)  
Total, net of tax (3.6) (3.9) (8.8)
Reconciliation of accumulated other comprehensive income:      
Accumulated other comprehensive income at beginning of plan year (3.9) (8.8)  
Net loss/(gain)amortized during the year 0.2 0.7  
Net loss / (gain) occurring during the year 0.6 2.9  
Currency exchange rate adjustment (0.5) 1.3  
Net adjustment to accumulated other comprehensive income 0.3 4.9  
Accumulated other comprehensive income at end of plan year (3.6) (3.9) (8.8)
Amounts in accumulative other comprehensive income amortized and recognized as a component of net periodic benefit cost, net of income tax      
Net loss / (gain) 0.6 2.9  
Amortization of net (loss) gain 0.2 0.7  
Total amortization expenses 0.8 3.6  
Expected Benefit Payments      
2013 9.6    
2014 1.6    
2015 1.7    
2016 1.6    
2017 1.6    
2018 to 2022 8.4    
Total 24.5    
Post retirement defined benefit plan | Peruvian operations
      
Assumptions used to determine the pension obligation and seniority premiums as of year-end and the net cost in the ensuing year      
Discount rate (as a percent) 3.35% 3.95% 5.00%
Expected long-term rate of return on plan asset (as a percent) 4.50% 4.50% 4.50%
Post retirement defined benefit plan | Mexican operations
      
Assumptions used to determine the pension obligation and seniority premiums as of year-end and the net cost in the ensuing year      
Discount rate (as a percent) 6.50% 7.50% 7.50%
Expected long-term rate of return on plan asset (as a percent) 6.50% 7.50% 7.50%
Rate of increase in future compensation level (as a percent) 4.00% 4.50% 4.00%
Post-retirement Health Care Plan
      
Defined benefit plan, net periodic benefit cost      
Service cost     0.4
Interest cost 1.5 3.3 4.4
Amortization of transition assets, net   1.3 1.5
Amortization of net loss/(gain)     0.1
Amortization of prior services cost/ (credit) (0.3) (10.0)  
Net periodic benefit costs 1.2 (5.4) 6.4
Change in benefit obligation:      
Projected benefit obligation at beginning of year 20.3 51.4  
Service cost     0.4
Interest cost 1.5 3.3 4.4
Amendments   (24.2)  
Actuarial loss/ (gain) claims cost (0.2)    
Benefits paid (1.5) (1.4)  
Actuarial (gain)/loss 5.6 (3.3)  
Actuarial gain assumption changes 0.1 0.2  
Inflation adjustment 1.4 (5.7)  
Projected benefit obligation at end of year 27.2 20.3 51.4
Change in plan assets:      
Employer contributions 0.1 0.1  
Benefits paid 0.1 0.1  
Funded status at end of year (27.2) (20.3)  
Amounts recognized in statement of financial position      
Current liabilities (0.1) (0.1)  
Non-current liabilities (27.1) (20.2)  
Total (27.2) (20.3)  
Amounts recognized in accumulated other comprehensive income      
Net loss (gain) (0.2) (3.4)  
Prior service cost (credit) (0.1) (0.1)  
Total, net of tax (0.3) (3.5) 8.6
Reconciliation of accumulated other comprehensive income:      
Accumulated other comprehensive income at beginning of plan year (3.5) 8.6  
Prior services cost amortized during the year   0.6  
Net loss / (gain) occurring during the year 3.3 (1.9)  
Amortization of transition obligation 0.2 (0.8)  
Prior service cost (credit)   (14.5)  
Currency exchange rate adjustment (0.3) (0.9)  
Net adjustment to accumulated other comprehensive income 3.2 (12.1)  
Accumulated other comprehensive income at end of plan year (0.3) (3.5) 8.6
Amounts in accumulative other comprehensive income amortized and recognized as a component of net periodic benefit cost, net of income tax      
Net loss / (gain) 3.3 (1.9)  
Amortization of transition obligation 0.2 (0.8)  
Amortization of prior service cost (credit)   (14.5)  
Total amortization expenses 3.5 (17.2)  
Expected Benefit Payments      
2013 1.6    
2014 1.6    
2015 1.7    
2016 1.8    
2017 2.0    
2018 to 2022 11.7    
Total 20.4    
Post-retirement Health Care Plan | Peruvian operations
      
Assumptions used to determine the pension obligation and seniority premiums as of year-end and the net cost in the ensuing year      
Discount rate (as a percent) 3.35% 3.95% 5.00%
Expected Benefit Payments      
Assumed trend rate for covered health care benefit cost (as a percent) 6.20%    
Assumed ultimate trend rate for health care benefit cost (as a percent) 4.60%    
Post-retirement Health Care Plan | Mexican operations
      
Expected Benefit Payments      
Assumed trend rate for covered health care benefit cost (as a percent) 4.60%    
Effect of one percentage-point change in assumed other benefit cost trend rates      
Effect of one percentage-point increase on total service and interest cost components 1.5    
Effect of one percentage-point decrease on total service and interest cost components (0.8)    
Effect of one percentage-point increase on post-retirement benefit obligation 28.6    
Effect of one percentage-point decrease on post-retirement benefit obligation $ (22.7)    
Post-retirement Health Care Plan | Weighted average | Mexican operations
      
Assumptions used to determine the pension obligation and seniority premiums as of year-end and the net cost in the ensuing year      
Discount rate (as a percent) 6.50% 7.50% 7.50%