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BENEFIT PLANS: (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
BENEFIT PLANS:      
Number of expatriate noncontributory defined benefit pension plans 2    
Post retirement defined benefit plan
      
Defined benefit plan, net periodic benefit cost      
Service cost $ 1.1 $ 1.0 $ 0.9
Interest cost 1.0 1.1 1.2
Expected return on plan assets (3.4) (3.6) (3.5)
Amortization of transition assets, net     (0.1)
Amortization of net actuarial loss (0.7) (0.8) (1.3)
Amortization of net loss/(gain) 0.2 0.1 0.1
Net periodic benefit cost (1.8) (2.2) (2.7)
Change in benefit obligation:      
Projected benefit obligation at beginning of year 27.9 25.2  
Service cost 1.1 1.0 0.9
Interest cost 1.0 1.1 1.2
Actuarial gain census (0.3) (0.1)  
Benefits paid (2.2) (2.0)  
Actuarial (gain)/loss 0.3 1.0  
Actuarial gain assumption changes (1.0) 0.8  
Inflation adjustment   0.9  
Projected benefit obligation at end of year 26.8 27.9 25.2
Change in plan assets:      
Fair value of plan assets at beginning of year 61.9 55.8  
Actual return on plan assets (0.2) 4.9  
Employer contributions 0.1 (0.6)  
Benefits paid (0.9) (1.1)  
Currency exchange rate adjustment (0.3) 2.9  
Fair value of plan assets at end of year 60.6 61.9 55.8
Funded status at end of year 33.8 34.0  
Amounts recognized in statement of financial position      
Non-current assets 33.8 34.0  
Total 33.8 34.0  
Amounts recognized in accumulated other comprehensive income      
Net loss (gain) (1.7) (3.7)  
Prior service cost (credit) 0.1 0.1  
Total, net of tax (1.6) (3.6) (3.8)
Net loss (gain), income taxes 1.5 2.9  
Reconciliation of accumulated other comprehensive income:      
Accumulated other comprehensive income at beginning of plan year (3.6) (3.8)  
Net loss/(gain) amortized during the year 0.4 0.5  
Net loss/(gain) occurring during the year 1.5 0.3  
Currency exchange rate adjustment 0.1 (0.6)  
Net adjustment to accumulated other comprehensive income 2.0 0.2  
Accumulated other comprehensive income at end of plan year (1.6) (3.6) (3.8)
Net adjustment to accumulated other comprehensive income, income taxes (1.3) (0.5)  
Amounts in accumulative other comprehensive income amortized and recognized as a component of net periodic benefit cost, net of income tax      
Net loss / (gain) 1.5 0.3  
Amortization of net (loss) gain 0.4 0.5  
Total amortization expenses 1.9 0.8  
Expected Benefit Payments      
2014 1.7    
2015 1.3    
2016 1.3    
2017 1.3    
2018 1.3    
2019 to 2023 7.4    
Total 14.3    
Post retirement defined benefit plan | Expatriate Health Plan
      
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) 4.25% 3.35% 3.95%
Expected long-term rate of return on plan asset (as a percent) 4.50% 4.50% 4.50%
Post retirement defined benefit plan | Mexican Health Plan
      
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) 7.10% 6.50% 7.50%
Expected long-term rate of return on plan asset (as a percent) 7.10% 6.50% 7.50%
Rate of increase in future compensation level (as a percent) 4.00% 4.00% 4.50%
Post-retirement Health Care Plan
      
Defined benefit plan, net periodic benefit cost      
Interest cost 1.7 1.5 3.3
Amortization of transition obligation     1.3
Amortization of prior services cost/ (credit)   (0.3) (10.0)
Net periodic benefit cost 1.7 1.2 (5.4)
Change in benefit obligation:      
Projected benefit obligation at beginning of year 27.2 20.3  
Interest cost 1.7 1.5 3.3
Actuarial loss/ (gain) - claims cost   (0.2)  
Benefits paid (0.1) (1.5)  
Actuarial (gain)/loss (6.8) 5.6  
Actuarial gain assumption changes (0.2) 0.1  
Inflation adjustment (0.1) 1.4  
Projected benefit obligation at end of year 21.7 27.2 20.3
Change in plan assets:      
Employer contributions 0.1 0.1  
Benefits paid (0.1) (0.1)  
Funded status at end of year (21.7) (27.2)  
Amounts recognized in statement of financial position      
Current liabilities (0.1) (0.1)  
Non-current liabilities (21.6) (27.1)  
Total (21.7) (27.2)  
Amounts recognized in accumulated other comprehensive income      
Net loss (gain) (4.3) (0.1)  
Prior service cost (credit) (0.1) (0.1)  
Total, net of tax (4.4) (0.3) (3.4)
Net loss (gain), income taxes 3.0 0.2  
Reconciliation of accumulated other comprehensive income:      
Accumulated other comprehensive income at beginning of plan year (0.3) (3.4)  
Net loss/(gain) occurring during the year (4.1) 3.2  
Amortization of transition obligation   0.2  
Currency exchange rate adjustment   (0.3)  
Net adjustment to accumulated other comprehensive income (4.1) 3.1  
Accumulated other comprehensive income at end of plan year (4.4) (0.3) (3.4)
Net adjustment to accumulated other comprehensive income, income taxes 2.8 (2.4)  
Amounts in accumulative other comprehensive income amortized and recognized as a component of net periodic benefit cost, net of income tax      
Net loss / (gain) (4.1) 3.2  
Amortization of transition obligation   0.2  
Total amortization expenses (4.1) 3.4  
Expected Benefit Payments      
2014 1.4    
2015 1.5    
2016 1.6    
2017 1.7    
2018 1.8    
2019 to 2023 10.5    
Total 18.5    
Post-retirement Health Care Plan | Expatriate Health Plan
      
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) 4.25% 3.35% 3.95%
Expected Benefit Payments      
Assumed trend rate for covered health care benefit cost (as a percent) 6.00%    
Assumed ultimate trend rate for health care benefit cost (as a percent) 4.60%    
Post-retirement Health Care Plan | Mexican Health Plan
      
Expected Benefit Payments      
Assumed trend rate for covered health care benefit cost (as a percent) 4.00%    
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 1.4    
Effect of one percentage-point decrease on total service and interest cost components 1.3    
Effect of one percentage-point increase on post-retirement benefit obligation 18.1    
Effect of one percentage-point decrease on post-retirement benefit obligation $ 22.4    
Post-retirement Health Care Plan | Weighted average | Mexican Health Plan
      
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) 7.10% 6.50% 7.50%