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CAPITAL STOCK - NARRATIVE (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fair value of stock options granted during period     $ 0.3 $ 3.5
Weighted average grant date fair value     $ 26.67 $ 26.74
Intrinsic value of options exercised     $ 11.6 $ 3.1
Proceeds from stock options exercised     $ 0.5 $ 1.3
Weighted average purchase price of shares purchased (in dollars per share) $ 18.69 $ 17.98 $ 18.82 $ 15.86
Employee Stock Option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Intrinsic value of options exercised     $ 15.9  
Total unrecognized compensation expense related to outstanding stock options $ 4.3   $ 4.3  
Period for recognition of unrecognized compensation expense     1 year 4 months 9 days  
Intrinsic value of options outstanding $ 18.3   $ 18.3  
Employee Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares issued during period 2,786 2,327 5,369 5,454
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total unrecognized compensation expense related to outstanding stock options $ 2.6   $ 2.6  
Period for recognition of unrecognized compensation expense     1 year 4 months  
Weighted average purchase price of shares purchased (in dollars per share) $ 71.35 $ 85.09 $ 71.38 $ 67.76
Fair value of stock vested   $ 0.3 $ 0.3 $ 4.4
Performance shares, nonprobable performance targets (in shares) 176,000   176,000  
Restricted Stock | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period     1 year  
Restricted Stock | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period     4 years