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ACQUISITION - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Jan. 25, 2018
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Business Acquisition [Line Items]        
Aggregate purchase price   $ 0.0 $ 303.7  
Cash acquired from acquisition $ 7.6      
Loss on extinguishment of debt   $ 0.0 1.4  
Muuto Acquisition        
Business Acquisition [Line Items]        
Percentage of voting interests acquired 100.00%      
Aggregate purchase price $ 303.7      
Acquisition costs     1.0  
Loss on extinguishment of debt     $ 2.4 $ 1.7