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OTHER NON-CURRENT LIABILITIES (Statutory severance and pre-notice obligations Narrative) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Jan. 01, 2017
Disclosure of defined benefit plans [line items]    
Cumulative amount of actuarial losses recognized in other comprehensive income $ 22.1 $ 22.0
Actuarial assumption of discount rate    
Disclosure of defined benefit plans [line items]    
Percentage of reasonably possible increase in actuarial assumption 1.00%  
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption $ (5.3)  
Percentage of reasonably possible decrease in actuarial assumption 1.00%  
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption $ 6.6  
Actuarial assumption of expected rates of compensation increases    
Disclosure of defined benefit plans [line items]    
Percentage of reasonably possible increase in actuarial assumption 1.00%  
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption $ 6.6  
Percentage of reasonably possible decrease in actuarial assumption 1.00%  
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption $ (5.4)  
Minimum    
Disclosure of defined benefit plans [line items]    
Actuarial assumption of discount rates 9.20% 9.75%
Actuarial assumption of expected rates of salary increases 8.00% 7.25%
Maximum    
Disclosure of defined benefit plans [line items]    
Actuarial assumption of discount rates 9.65% 9.85%
Actuarial assumption of expected rates of salary increases 10.00% 7.50%