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EQUITY AND LONG-TERM INCENTIVE COMPENSATION - Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Mar. 31, 2018
Dec. 31, 2017
Apr. 01, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss)                
Components of accumulated other comprehensive income, net of tax [Roll Forward]                
Balance at beginning of period $ 254.5 $ 234.1 $ 250.1 $ 235.1        
Other comprehensive loss before reclassifications (2.3) 0.5 (1.6) 0.1        
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 (0.7) (0.4) (1.5) (1.0)        
Current-period other comprehensive loss (3.0) 0.1 1.4 (0.9)        
Balance at end of period 251.5 234.2 251.5 234.2        
Foreign Currency Translation Adjustment                
Components of accumulated other comprehensive income, net of tax [Roll Forward]                
Balance at beginning of period 231.2 228.2 230.2 229.7        
Other comprehensive loss before reclassifications (1.8) 1.1 (0.8) (0.4)        
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 0.0 0.0        
Current-period other comprehensive loss (1.8) 1.1 (0.8) (0.4)        
Balance at end of period 229.4 229.3 229.4 229.3        
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 0.3 2.2 0.8 1.5        
Other comprehensive loss before reclassifications (0.5) (0.6) (0.8) 0.5        
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 0.0 (0.3) (0.1) (0.7)        
Current-period other comprehensive loss (0.5) (0.9) (1.0) (0.2)        
Balance at end of period (0.2) 1.3 (0.2) 1.3        
Tax benefit (provision) 0.1 (0.8) 0.1 (0.8) $ (0.1) $ (0.5) $ (1.3) $ (0.9)
Pension and Postretirement Liability Adjustment                
Components of accumulated other comprehensive income, net of tax [Roll Forward]                
Balance at beginning of period 23.0 3.7 19.1 3.9        
Other comprehensive loss before reclassifications 0.0 0.0 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) (0.1) (1.4) (0.3)        
Current-period other comprehensive loss (0.7) (0.1) 3.2 (0.3)        
Balance at end of period 22.3 3.6 22.3 3.6        
Tax benefit (provision) $ (7.3) $ (2.6) $ (7.3) $ (2.6) $ (7.6) $ (12.5) $ (2.7) $ (2.7)