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SHARE-BASED COMPENSATION AND EMPLOYEE BENEFIT PLANS (Share-based Compensation) (Details) - USD ($)
$ in Millions
12 Months Ended 56 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of instruments provided for grant 1,500,000.0     1,500,000.0
Number of shares still available for grant across all plans (in shares) 1,000,000     1,000,000
Share-based compensation expense $ 12.0 $ 10.0 $ 8.6  
Share-based compensation expense, tax benefit 4.5 $ 3.8 $ 3.3  
Total unrecognized share-based compensation expense related to nonvested awards 12.6     $ 12.6
Expected future recognition of unrecognized compensation expense related to nonvested share-based awards, 2017 7.4      
Expected future recognition of unrecognized compensation expense related to nonvested share-based awards, 2018 4.0      
Expected future recognition of unrecognized compensation expense related to nonvested share-based awards, 2019 $ 1.2      
Performance Share Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Cumulative shares granted to date (in shares)       600,000.0
Number of shares forfeited or repurchased (in shares) 13,554     600,000.0
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Cumulative shares granted to date (in shares)       500,000.0
Number of shares forfeited or repurchased (in shares) 19,604