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CAPITAL STOCK (Details) - shares
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cumulative preferred stock, shares outstanding (in shares) 0 0  
Balance at beginning of period, treasury stock (in shares) 55,971,691    
Balance at end of period, treasury stock (in shares) 57,134,828 55,971,691  
Stock Issued During Period, Shares, Restricted Stock Award, Retained 41,019 26,107 39,075
Stock Issued During Period, Shares, Performance Share Units, Retained 16,830 6,737 1,027
Common Stock [Member]      
Balance at beginning of period, common stock (in shares) 53,687,528 55,862,360 56,328,863
Exercised (in shares) 311,374 232,052 930,258
Settlement of restricted stock units, net of 41,019, 26,107 and 39,075 shares retained, respectively (in shares) 82,241 52,182 80,988
Settlement of performance share units, net of 16,830, 6,737 and 1,027 shares retained, respectively (in shares) 28,098 14,027 1,911
Purchase of treasury shares (in shares) (1,584,850) (2,473,093) (1,479,660)
Balance at end of period, common stock (in shares) 52,524,391 53,687,528 55,862,360
Treasury Stock [Member]      
Balance at beginning of period, treasury stock (in shares) 55,971,691 53,796,859 53,330,356
Exercised (in shares) (311,374) (232,052) (930,258)
Settlement of restricted stock units, net of 41,019, 26,107 and 39,075 shares retained, respectively (in shares) (82,241) (52,182) (80,988)
Settlement of performance share units, net of 16,830, 6,737 and 1,027 shares retained, respectively (in shares) (28,098) (14,027) (1,911)
Purchase of treasury shares (in shares) 1,584,850 2,473,093 1,479,660
Balance at end of period, treasury stock (in shares) 57,134,828 55,971,691 53,796,859