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RELATED PARTY TRANSACTIONS WITH IAC - Narrative (Details) - IAC
€ in Millions, $ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
shares
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
shares
Jun. 30, 2017
USD ($)
Dec. 31, 2017
EUR (€)
Jun. 30, 2018
EUR (€)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
EUR (€)
Related Party Transaction [Line Items]                
Allocated general and administrative costs from related party activities   $ 1.7   $ 3.1        
Amounts due to related party             $ 2.0  
Notes Payable | Promissory Note Due December 31, 2020                
Related Party Transaction [Line Items]                
Increase (decrease) in long-term debt - related parties | €         € (2.4)      
Long-term debt - related party $ 1.6   $ 1.6     € 1.4 2.8 € 2.4
Employee Matters Agreement                
Related Party Transaction [Line Items]                
Shares received from related party pursuant to employee matters agreement (in shares) | shares 0   700,000          
Services Agreement                
Related Party Transaction [Line Items]                
Payments received from related parties $ 1.2   $ 2.7          
Amounts due to related party             $ 0.4