Annual report pursuant to Section 13 and 15(d)

INVESTMENT IN AMAK AND DISCONTINUED OPERATIONS - Narrative (Details)

v3.20.4
INVESTMENT IN AMAK AND DISCONTINUED OPERATIONS - Narrative (Details)
ر.س in Millions, $ in Millions
3 Months Ended 12 Months Ended
Mar. 26, 2020
SAR (ر.س)
Mar. 26, 2020
USD ($)
shares
Oct. 02, 2019
Sep. 22, 2019
SAR (ر.س)
Sep. 22, 2019
USD ($)
Sep. 30, 2020
SAR (ر.س)
Sep. 30, 2020
USD ($)
shares
Dec. 31, 2020
USD ($)
ر.س / $
Jan. 01, 2021
USD ($)
Sep. 28, 2020
Dec. 31, 2019
USD ($)
Schedule of Equity Method Investments [Line Items]                      
Non refundable deposit forfeited prior to long stop date             50.00%        
Equity method investment shares sold | shares             22,467,422        
Proceeds from sales deposit of equity method investments   $ 0.5                  
Accrued income taxes             $ 1.1        
Investment deposits forfeited             1.5 $ 1.5      
Purchase price held by purchaser for tax obligations               $ 2.1      
Foreign exchange rate (SR per USD) | ر.س / $               3.75      
Saudi Industrial Development Fund Limited Guarantee                      
Schedule of Equity Method Investments [Line Items]                      
Loan guarantee percentage               41.00%      
Foreign Tax Authority                      
Schedule of Equity Method Investments [Line Items]                      
Accrued income taxes   0.3                  
AMAK                      
Schedule of Equity Method Investments [Line Items]                      
Proceeds from sale of investment ر.س 40 $ 10.7   ر.س 265 $ 70.0 ر.س 224 $ 59.9        
Percentage investment in AMAK                     33.30%
Investments in AMAK                     $ 32.9
Non-refundable deposit of amount sold, percentage     5.00%     5.00% 5.00%        
Equity method investment amount sold non refundable deposit             $ 3.5        
Non refundable deposit forfeited prior to long stop date                   50.00%  
Equity method investment shares sold | shares   4,000,000                  
Foreign exchange rate (SR per USD) | ر.س / $               3.75      
AMAK | Subsequent Event                      
Schedule of Equity Method Investments [Line Items]                      
Accrued income taxes                 $ 1.1    
AMAK | Foreign Tax Authority                      
Schedule of Equity Method Investments [Line Items]                      
Foreign income tax expense (benefit), continuing operations               $ 0.2