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BENEFIT PLANS: (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2015
USD ($)
plan
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
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 $ 1.1 $ 1.0 $ 1.1    
Interest cost 1.0 1.1 1.0    
Expected return on plan assets (3.0) (3.3) (3.4)    
Amortization of transition assets, net 0.1 0.1      
Amortization of net actuarial loss (0.5) (0.4) (0.7)    
Amortization of net loss (gain) 0.2 0.2 0.2    
Net periodic benefit cost (1.1) (1.3) (1.8)    
Change in benefit obligation:          
Projected benefit obligation at beginning of year 25.8 26.8      
Service cost 1.1 1.0 1.1    
Interest cost 1.0 1.1 1.0    
Benefits paid (2.9) (1.9)      
Actuarial (gain)/loss 2.4 (1.6)      
Actuarial gain assumption changes (0.7) 2.2      
Inflation adjustment (1.8) (1.8)      
Projected benefit obligation at end of year 24.9 25.8 26.8    
Change in plan assets:          
Fair value of plan assets at beginning of year 57.7 60.6      
Actual return on plan assets (3.2) 3.7      
Employer contributions (0.5) (0.5)      
Benefits paid (1.0) (1.1)      
Currency exchange rate adjustment (6.2) (5.0)      
Fair value of plan assets at end of year 46.8 57.7 60.6    
Funded status at end of year       $ 21.9 $ 31.9
Amounts recognized in statement of financial position          
Non-current assets       21.9 31.9
Total       21.9 31.9
Amounts recognized in accumulated other comprehensive income          
Net loss (gain)       4.4 (1.3)
Prior service cost (credit)       1.3 1.6
Total, net of tax 0.3 (1.6) (1.6) 5.7 0.3
Net loss (gain), income taxes       (3.2) 0.4
Reconciliation of accumulated other comprehensive income:          
Accumulated other comprehensive income at beginning of plan year 0.3 (1.6)      
Net loss/(gain) amortized during the year 0.2 0.1      
Net loss/(gain) occurring during the year 4.7 0.2      
Amortization of transition obligation (0.1) (0.1)      
Currency exchange rate adjustment 0.6 1.7      
Net adjustment to accumulated other comprehensive income 5.4 1.9      
Accumulated other comprehensive income at end of plan year 5.7 0.3 $ (1.6)    
Net adjustment to accumulated other comprehensive income, income taxes (3.6) (1.1)      
Amounts in accumulated other comprehensive income amortized and recognized as a component of net periodic benefit cost, net of income tax          
Net loss / (gain) 4.7 0.2      
Amortization of net (loss) gain 0.2 0.1      
Amortization of transition obligation (0.1) (0.1)      
Total amortization expenses $ 4.8 $ 0.2      
Expected Benefit Payments          
2016       8.1  
2017       1.4  
2018       1.5  
2019       1.5  
2020       1.5  
2021 to 2025       7.4  
Total       21.4  
Post retirement defined benefit plans | Expatriate Plan          
Assumptions used to determine the pension obligation and other post-retirement benefits and cost          
Discount rate (as a percent) 3.80% 3.50% 4.25%    
Expected long-term rate of return on plan asset (as a percent) 4.50% 4.50% 4.50%    
Post retirement defined benefit plans | Mexican Health Plan          
Assumptions used to determine the pension obligation and other post-retirement benefits and cost          
Discount rate (as a percent) 6.80% 6.70% 7.10%    
Expected long-term rate of return on plan asset (as a percent) 6.80% 6.70% 7.10%    
Rate of increase in future compensation level (as a percent) 4.50% 4.00% 4.00%    
Post-retirement Health Care Plan          
Defined benefit plan, net periodic benefit costs          
Interest cost $ 1.0 $ 1.3 $ 1.7    
Amortization of prior service cost (credit) (0.4) (0.3)      
Net periodic benefit cost 0.6 1.0 1.7    
Change in benefit obligation:          
Projected benefit obligation at beginning of year 17.1 21.7      
Interest cost 1.0 1.3 1.7    
Actuarial loss/ (gain) - claims cost (0.4) (0.2)      
Benefits paid (0.7) (0.6)      
Actuarial (gain)/loss (3.9) (3.2)      
Actuarial gain assumption changes (0.1) 0.4      
Inflation adjustment (2.2) (2.3)      
Projected benefit obligation at end of year 10.8 17.1 21.7    
Change in plan assets:          
Employer contributions 0.1 0.1      
Benefits paid (0.1) (0.1)      
Funded status at end of year       (10.8) (17.1)
Amounts recognized in statement of financial position          
Current liabilities       (0.1) (0.1)
Non-current liabilities       (10.7) (17.0)
Total       (10.8) (17.1)
Amounts recognized in accumulated other comprehensive income          
Net loss (gain)       (6.5) (4.8)
Total, net of tax (4.8) (4.4) (4.4) (6.5) (4.8)
Net loss (gain), income taxes       4.4 $ 3.3
Reconciliation of accumulated other comprehensive income:          
Accumulated other comprehensive income at beginning of plan year (4.8) (4.4)      
Net loss/(gain) amortized during the year 0.2 0.2      
Net loss/(gain) occurring during the year (2.7) (1.7)      
Currency exchange rate adjustment 0.8 1.1      
Net adjustment to accumulated other comprehensive income (1.7) (0.4)      
Accumulated other comprehensive income at end of plan year (6.5) (4.8) $ (4.4)    
Net adjustment to accumulated other comprehensive income, income taxes 4.4 3.3      
Amounts in accumulated other comprehensive income amortized and recognized as a component of net periodic benefit cost, net of income tax          
Net loss / (gain) (2.7) (1.7)      
Amortization of net (loss) gain 0.2 0.2      
Total amortization expenses $ (2.5) $ (1.5)      
Expected Benefit Payments          
2016       0.7  
2017       0.7  
2018       0.7  
2019       0.7  
2020       0.8  
2021 to 2025       3.8  
Total       $ 7.4  
Post-retirement Health Care Plan | Expatriate Plan          
Assumptions used to determine the pension obligation and other post-retirement benefits and cost          
Discount rate (as a percent) 3.80% 3.50% 4.25%    
Expected Benefit Payments          
Assumed trend rate for covered health care benefit cost (as a percent) 7.00%        
Assumed trend rate for covered health care benefit cost post-65 years of age (as a percent) 8.20%        
Assumed ultimate trend rate for health care benefit cost (as a percent) 4.20%        
Assumed ultimate trend rate for health care benefit cost post-65 years of age (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) 4.50%        
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 $ 0.7        
Effect of one percentage-point decrease on total service and interest cost components 0.6        
Effect of one percentage-point increase on post-retirement benefit obligation 10.2        
Effect of one percentage-point decrease on post-retirement benefit obligation $ 9.2        
Post-retirement Health Care Plan | Weighted average | Mexican Health Plan          
Assumptions used to determine the pension obligation and other post-retirement benefits and cost          
Discount rate (as a percent) 6.80% 6.70% 7.10%