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SHARE-BASED COMPENSATION - Performance Awards (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation $ 12.3 $ 7.9 $ 7.3
Long Term Performance Stock Unit Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation 4.3 0.8 (0.4)
Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Intrinsic value of units vested $ 0.3 $ 0.0 $ 0.4
Weighted Average Fair Value      
Granted (in USD per share)   $ 19.68  
Market Conditions | Performance Shares      
No. of Stock Units      
Beginning of year (in shares) [1] 45    
Granted (in shares) [1] 465    
Vested and settled (in shares) [1] 0    
Cancelled (in shares) [1] (15)    
End of year (in shares) [1] 495 45  
Weighted Average Fair Value      
Beginning of year (in USD per share) $ 17.66    
Granted (in USD per share) 14.24    
Vested and settled (in USD per share) 0.00    
Cancelled (in USD per share) 16.78    
Stock and stock units, end of year (in USD per share) $ 14.47 $ 17.66  
Other than Market Conditions | Performance Shares      
No. of Stock Units      
Beginning of year (in shares) [1] 84    
Granted (in shares) [1] 115    
Vested and settled (in shares) [1] (15)    
Cancelled (in shares) [1] (39)    
End of year (in shares) [1] 145 84  
Weighted Average Fair Value      
Beginning of year (in USD per share) $ 25.76    
Granted (in USD per share) 15.00    
Vested and settled (in USD per share) 13.45    
Cancelled (in USD per share) 27.95    
Stock and stock units, end of year (in USD per share) $ 17.88 $ 25.76  
[1] Performance units with variable payouts are shown at target level of performance.