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CAPITAL STOCK AND STOCK AWARD PLANS - Narrative (Details)
$ / shares in Units, $ in Millions
12 Months Ended
May 09, 2019
shares
Dec. 31, 2020
USD ($)
vote
$ / shares
shares
Dec. 31, 2019
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Preferred stock, authorized (in shares)   20,000,000 20,000,000
Preferred stock, par value (in dollars per share) | $ / shares   $ 0.10 $ 0.10
Preferred stock, outstanding (in shares)   0 0
Common stock, authorized (in shares)   480,000,000 480,000,000
Common stock, par value (in dollars per share) | $ / shares   $ 0.10 $ 0.10
Entitled vote for each share of common stock (vote) | vote   1  
Increase in number of shares authorized for award (in shares) 4,000,000    
Maximum number of shares that can be granted under stock plan (in shares) 17,041,803    
Shares available for stock awards (in shares)   2,985,595  
Unrecognized compensation expense related to stock options | $   $ 42.9  
Stock options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Antidilutive securities excluded from computation of earnings per share (in shares)   2,455,138  
Performance-based restricted shares and restricted stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock award vesting period (in years)   5 years  
Restricted shares and restricted stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation expense related to stock awards | $   $ 113.1  
Restricted shares and restricted stock units | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted shares and restricted stock unit grants, discount for post-vesting holding restrictions (percent)   12.00%  
Restricted shares and restricted stock units | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted shares and restricted stock unit grants, discount for post-vesting holding restrictions (percent)   22.00%