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EQUITY AND LONG-TERM INCENTIVE COMPENSATION - Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Dec. 31, 2017
Dec. 31, 2016
Components of accumulated other comprehensive income, net of tax [Roll Forward]        
Stranded income tax effects resulting from tax reform $ (4.8) $ 0.0    
Accumulated Other Comprehensive Income (Loss)        
Components of accumulated other comprehensive income, net of tax [Roll Forward]        
Balance at beginning of period 250.1 235.1    
Other comprehensive income (loss) before reclassifications 0.7 (0.4)    
Impact of initial adoption of ASC 606 (0.3)      
Stranded income tax effects resulting from tax reform 4.8      
Amounts reclassified from accumulated other comprehensive income: (0.8) (0.6)    
Current-period other comprehensive income (loss) 4.4 (1.0)    
Balance at end of period 254.5 234.1    
Foreign Currency Translation Adjustment        
Components of accumulated other comprehensive income, net of tax [Roll Forward]        
Balance at beginning of period 230.2 229.7    
Other comprehensive income (loss) before reclassifications 1.0 (1.5)    
Impact of initial adoption of ASC 606 0.0      
Stranded income tax effects resulting from tax reform 0.0      
Amounts reclassified from accumulated other comprehensive income: 0.0 0.0    
Current-period other comprehensive income (loss) 1.0 (1.5)    
Balance at end of period 231.2 228.2    
Net Unrealized Gains (Losses) on Qualifying Cash Flow Hedges        
Components of accumulated other comprehensive income, net of tax [Roll Forward]        
Balance at beginning of period 0.8 1.5    
Other comprehensive income (loss) before reclassifications (0.3) 1.1    
Impact of initial adoption of ASC 606 (0.3)      
Stranded income tax effects resulting from tax reform 0.2      
Amounts reclassified from accumulated other comprehensive income: (0.1) (0.4)    
Current-period other comprehensive income (loss) (0.5) 0.7    
Balance at end of period 0.3 2.2    
Tax benefit (provision) 0.1 (1.3) $ 0.5 $ (0.9)
Pension and Postretirement Liability Adjustment        
Components of accumulated other comprehensive income, net of tax [Roll Forward]        
Balance at beginning of period 19.1 3.9    
Other comprehensive income (loss) before reclassifications 0.0 0.0    
Impact of initial adoption of ASC 606 0.0      
Stranded income tax effects resulting from tax reform 4.6      
Amounts reclassified from accumulated other comprehensive income: (0.7) (0.2)    
Current-period other comprehensive income (loss) 3.9 (0.2)    
Balance at end of period 23.0 3.7    
Tax benefit (provision) $ 0.0 $ 2.7 $ (12.5) $ 2.7