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CAPITAL STOCK - NARRATIVE (Details)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Jul. 25, 2018
shares
May 03, 2018
shares
Mar. 17, 2018
shares
Mar. 07, 2018
tranche
shares
Jun. 15, 2017
shares
May 31, 2017
shares
May 01, 2017
shares
Mar. 26, 2017
tranche
shares
Mar. 02, 2016
shares
Mar. 17, 2015
shares
Mar. 26, 2014
tranche
shares
Sep. 30, 2018
USD ($)
$ / shares
shares
Sep. 30, 2017
$ / shares
shares
Sep. 30, 2018
USD ($)
$ / shares
shares
Sep. 30, 2017
USD ($)
$ / shares
shares
May 07, 2018
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Fair value of stock options granted during period | $                           $ 4.4 $ 1.0  
Weighted average grant date fair value | $ / shares                           $ 28.74 $ 37.41  
Intrinsic value of options exercised | $                           $ 6.6 $ 16.5  
Proceeds from stock options exercised | $                           $ 3.0 $ 1.8  
Weighted average purchase price of shares purchased | $ / shares                       $ 23.44 $ 16.49 $ 17.85 $ 15.90  
Stockholder ownership percentage, threshold for restrictions                       5.00%        
Non-employee director                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Shares issued during period   4,230                            
Award vesting period   1 year                            
Share Purchase Plan 1997                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Shares issued during period under options       130,000                        
Share Purchase Plan 1997 | Non-employee director                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Shares issued during period under options       120,000                        
Employee Stock Option                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Intrinsic value of options exercised | $                           $ 38.9    
Total unrecognized compensation expense related to outstanding stock options | $                       $ 5.9   $ 5.9    
Period for recognition of unrecognized compensation expense                           1 year 9 months 16 days    
Intrinsic value of options outstanding | $                       $ 49.5   $ 49.5    
Employee Stock                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Shares issued during period                       1,942 2,515 7,396 8,058  
Increase in shares authorized   250,000                            
Restricted Stock                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Total unrecognized compensation expense related to outstanding stock options | $                       $ 3.7   $ 3.7    
Period for recognition of unrecognized compensation expense                           1 year 10 months 6 days    
Number of tranches in share-based payment award | tranche       3                        
Equity instruments other than options, shares tied to S&P 500 Index                               27,539
Restricted Stock | Minimum                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Equity instruments other than options, performance period       2 years                        
Restricted Stock | Maximum                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Equity instruments other than options, performance period       4 years                        
Restricted Stock | Non-employee director                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Shares issued during period             2,720,000                  
Restricted Stock | Kevin S. Wilson                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Shares issued during period               27,500     110,000          
Number of tranches in share-based payment award | tranche               4     4          
Performance Shares                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Shares issued during period           23,700,000       52,956            
Performance Shares | Management Incentive Plan Grants 2015                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Shares vested during period     52,956                          
Performance shares canceled     0                          
Shares withheld for income tax expense     14,334                          
Performance Shares | Management Incentive Plan (MIP) Grants 2016                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Shares issued during period                 15,000              
Shares vested during period                 14,629              
Performance shares canceled                 371              
Shares withheld for income tax expense                 4,133              
Performance Shares | Management Incentive Plan (MIP) Grants 2017                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Shares issued during period         6,594,000                      
Performance Shares | Kevin S. Wilson                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Shares issued during period   33,000                            
Performance Restricted Common Stock and Stock Options                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Shares issued during period under options 25,000     128,500                        
Performance Restricted Common Stock and Stock Options | Non-employee director                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Shares issued during period under options 20,000                              
Performance Restricted Common Stock and Stock Options | Share Purchase Plan 1997                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Shares issued during period under options       118,500