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SHAREHOLDERS' EQUITY - Common shares (Details) - $ / shares
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Class of Stock [Line Items]      
Authorized share capital, common (in shares) 800,000,000    
Par value per share, common (in usd per share) $ 0.0125    
Common Shares Issued and Outstanding [Roll Forward]      
Shares issued, balance at beginning of year (in shares) 176,580,000    
Total shares issued at end of year (in shares) 176,580,000 176,580,000  
Treasury Shares Issued and Outstanding [Roll Forward]      
Treasury shares, balance at beginning of year (in shares) (92,621,000)    
Total treasury shares at end of year (in shares) (92,227,000) (92,621,000)  
Total shares outstanding (in shares) 84,353,000 83,959,000  
Common shares      
Common Shares Issued and Outstanding [Roll Forward]      
Shares issued, balance at beginning of year (in shares) 176,580,000 176,580,000 176,580,000
Shares issued (in shares) 0 0 0
Total shares issued at end of year (in shares) 176,580,000 176,580,000 176,580,000
Treasury Shares Issued and Outstanding [Roll Forward]      
Treasury shares, balance at beginning of year (in shares) (92,621,000) (92,994,000) (93,419,000)
Shares repurchased (in shares) (194,000) (176,000) (200,000)
Shares reissued from treasury (in shares) 588,000 549,000 625,000
Total treasury shares at end of year (in shares) (92,227,000) (92,621,000) (92,994,000)
Total shares outstanding (in shares) 84,353,000 83,959,000 83,586,000