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EMPLOYEE BENEFIT PLANS - Other information (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Jan. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Employee benefits            
Unexercised stock options outstanding       0    
Stock Options            
Employee benefits            
Total remaining compensation cost related to unvested share options       $ 0.0    
Restricted Stock            
Employee benefits            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Issued       6,300,000    
Total remaining compensation cost related to unvested share options       $ 3.9    
Weighted average remaining contractual life       1 year 7 months 6 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value       $ 38.35    
Stock based compensation expense       $ 4.8 $ 4.3 $ 4.0
Initial performance period to make adjustments       1 year    
Restricted Stock | Minimum            
Employee benefits            
Vesting period       3 years    
Restricted Stock | Maximum            
Employee benefits            
Vesting period       4 years    
Long Term Incentive Plan            
Employee benefits            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Issued       2,900,000    
Total remaining compensation cost related to unvested share options       $ 9.8    
Shares available for issuance under plan       6,300,000    
Weighted average remaining contractual life       1 year 4 months 24 days    
Number of share options exercisable       858,000 611  
Stock based compensation expense       $ 12.4 $ 9.9 8.9
Short Term Incentive Plan            
Employee benefits            
Stock based compensation expense         $ 0.0 $ 0.0
2017 LTIP            
Employee benefits            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage           100.00%
FFO as Adjusted Per Share, Value     $ 16.63      
Share Price     $ 35.95      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate     23.00%      
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date     7.50%      
2017 LTIP | First portion of awards            
Employee benefits            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage     30.00%      
FFO as Adjusted Per Share, Value     $ 16.18      
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date     10.00%      
Vesting period     1 year      
2017 LTIP | 50% vesting out of first portion of LTI Award            
Employee benefits            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage     50.00%      
2017 LTIP | Balance 50% vesting out of first portion of LTI Award            
Employee benefits            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage     50.00%      
2017 LTIP | Second portion of awards            
Employee benefits            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   100.00% 10.00%      
Vesting period     3 years     3 years
2017 LTIP | Third portion of awards            
Employee benefits            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage     60.00%      
Vesting period     3 years     3 years
2017 LTIP | Relative component            
Employee benefits            
FFO as Adjusted Per Share, Value     $ 20.54      
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date     7.50%      
2017 LTIP | Absolute component            
Employee benefits            
FFO as Adjusted Per Share, Value     $ 14.71      
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date     7.50%      
2017 LTIP | Restricted Stock | Relative component            
Employee benefits            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 44.26      
2017 LTIP | Restricted Stock | Absolute component            
Employee benefits            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 31.40      
2018 LTIP            
Employee benefits            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage         100.00%  
FFO as Adjusted Per Share, Value   $ 18.08        
Share Price   $ 38.06        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate   17.00%        
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date   5.00%        
Vesting period   3 years        
2018 LTIP | First portion of awards            
Employee benefits            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   30.00%        
FFO as Adjusted Per Share, Value   $ 17.13        
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date   10.00%        
Vesting period   1 year        
2018 LTIP | 50% vesting out of first portion of LTI Award            
Employee benefits            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   50.00%        
2018 LTIP | Balance 50% vesting out of first portion of LTI Award            
Employee benefits            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   50.00%        
2018 LTIP | Second portion of awards            
Employee benefits            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   15.00%        
Vesting period   3 years   3 years    
2018 LTIP | Third portion of awards            
Employee benefits            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   55.00%        
Vesting period   3 years   3 years    
2018 LTIP | Relative component            
Employee benefits            
FFO as Adjusted Per Share, Value   $ 20.12        
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date   5.00%        
2018 LTIP | Absolute component            
Employee benefits            
FFO as Adjusted Per Share, Value   $ 19.35        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate         17.00%  
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date   5.00%        
2018 LTIP | Restricted Stock | Relative component            
Employee benefits            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 42.18        
2018 LTIP | Restricted Stock | Absolute component            
Employee benefits            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 40.49        
2019 LTIP | Restricted Stock | Relative component            
Employee benefits            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 43.63          
2019 LTIP | Restricted Stock | Absolute component            
Employee benefits            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value 43.42          
2019 LTIP | Long Term Incentive Plan            
Employee benefits            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage       100.00%    
FFO as Adjusted Per Share, Value 18.24          
Share Price $ 38.39          
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate 21.00%          
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date 5.00%          
Vesting period 3 years          
2019 LTIP | Long Term Incentive Plan | First portion of awards            
Employee benefits            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 30.00%          
FFO as Adjusted Per Share, Value $ 17.47          
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date 9.00%          
Vesting period 1 year          
2019 LTIP | Long Term Incentive Plan | 50% vesting out of first portion of LTI Award            
Employee benefits            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 50.00%          
2019 LTIP | Long Term Incentive Plan | Balance 50% vesting out of first portion of LTI Award            
Employee benefits            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 50.00%          
2019 LTIP | Long Term Incentive Plan | Second portion of awards            
Employee benefits            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 15.00%          
Vesting period 3 years     3 years    
2019 LTIP | Long Term Incentive Plan | Third portion of awards            
Employee benefits            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 55.00%          
Vesting period 3 years     3 years    
2019 LTIP | Long Term Incentive Plan | Relative component            
Employee benefits            
FFO as Adjusted Per Share, Value $ 20.89          
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date 5.00%          
2019 LTIP | Long Term Incentive Plan | Absolute component            
Employee benefits            
FFO as Adjusted Per Share, Value $ 20.79          
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate       21.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date 5.00%          
2019 LTIP | Short Term Incentive Plan            
Employee benefits            
FFO as Adjusted Per Share, Value $ 33.40          
Stock based compensation expense       $ 7.2    
Vesting period 1 year          
Initial performance period to make adjustments 1 year          
Unrecognized compensation expense       $ 0.0    
Long Term Incentive Plan            
Employee benefits            
Shares reserved for issuance under plan       19,000,000.0    
Profit Sharing Plan            
Employee benefits            
Aggregate provisions for contributions       $ 1.2 $ 1.3 $ 1.3