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STOCK-BASED COMPENSATION (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock-based compensation expense   $ 3.4 $ 1.9 $ 10.4 $ 9.7      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value       10.6 15.4      
Total unrecognized compensation cost   $ 20.5   20.5        
Tax benefit associated with exercise of awards       $ 4.0 $ 5.6      
Share-based Compensation Award, Tranche One [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Performance-based awards outstanding (in shares)   76,447   76,447        
Performance-based Awards - Peer Group Total Shareholder Return [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Performance-based awards outstanding (in shares)   76,447   76,447        
Scenario, Forecast [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock-based compensation expense $ 3.5         $ 0.6 $ 6.0 $ 10.4