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LONG-TERM DEBT - Components of Long-term Debt (Details)
12 Months Ended
Mar. 31, 2020
USD ($)
Dec. 31, 2018
USD ($)
Mar. 31, 2019
USD ($)
Mar. 06, 2019
USD ($)
Dec. 31, 2018
EUR (€)
Dec. 31, 2018
USD ($)
Apr. 30, 2018
USD ($)
Sep. 07, 2016
Debt Instrument [Line Items]                
Long-term debt     $ 3,113,600,000     $ 3,075,800,000    
Less current portion     (389,700,000)     (348,100,000)    
Long-term debt     2,723,900,000     2,727,700,000    
Short-term borrowings     8,600,000     9,300,000    
2018 Foreign Asset-Based Term Loan Credit Agreement due 2021                
Debt Instrument [Line Items]                
Long-term debt     81,000,000     82,700,000    
2016 Revolving Credit Facility due 2021                
Debt Instrument [Line Items]                
Long-term debt     371,600,000     330,000,000    
Less current portion     (371,600,000)     (330,000,000)    
2016 Term Loan due 2023                
Debt Instrument [Line Items]                
Long-term debt     1,721,800,000     1,724,600,000    
Repayment of debt   $ 18,000,000            
Amount by which available liquidity does not exceed principal amount of other debt     200,000,000          
Aggregate principal amount outstanding     $ 1,755,000,000          
5.75% Senior Notes due 2021                
Debt Instrument [Line Items]                
Stated interest rate     5.75%       5.75%  
Long-term debt     $ 497,000,000     496,600,000    
Aggregate principal amount outstanding     $ 500,000,000          
6.25% Senior Notes due 2024                
Debt Instrument [Line Items]                
Stated interest rate     6.25%         6.25%
Long-term debt     $ 441,800,000     441,400,000    
Aggregate principal amount outstanding     450,000,000          
Spanish Government Loan due 2025                
Debt Instrument [Line Items]                
Long-term debt     400,000     $ 500,000    
Scenario, Forecast | 2016 Revolving Credit Facility due 2021                
Debt Instrument [Line Items]                
Repayment of debt $ 18,000,000              
Revolving Credit Facility | 2016 Revolving Credit Facility due 2021                
Debt Instrument [Line Items]                
Maximum borrowing capacity     441,500,000.0          
Revolving Credit Facility | Amended 2016 Revolving Credit Facility, Tranche A                
Debt Instrument [Line Items]                
Long-term debt             $ 338,200,000  
Maximum borrowing capacity     400,000,000.0       400,000,000  
Amount by which available liquidity does not exceed principal amount of other debt             200,000,000  
Revolving Credit Facility | Amended 2016 Revolving Credit Facility, Tranche B                
Debt Instrument [Line Items]                
Long-term debt             37,500,000  
Maximum borrowing capacity     $ 41,500,000.0 $ 41,500,000.0     41,500,000.0  
Letter of Credit | Amended 2016 Revolving Credit Facility, Tranche A                
Debt Instrument [Line Items]                
Long-term debt             $ 10,900,000  
Secured Debt | 2018 Foreign Asset-Based Term Loan Credit Agreement due 2021                
Debt Instrument [Line Items]                
Maximum borrowing capacity | €         € 77,000,000