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LONG-TERM DEBT AND CREDIT FACILITIES - Debt repayments (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Long-term debt  
Total debt payable $ 1,950.0
2021  
Long-term debt  
Total debt payable 500.0
2022  
Long-term debt  
Total debt payable 40.0
2023  
Long-term debt  
Total debt payable 36.0
2024  
Long-term debt  
Total debt payable 532.0
2025  
Long-term debt  
Total debt payable 4.0
2026+  
Long-term debt  
Total debt payable 838.0
Senior notes  
Long-term debt  
Total debt payable 1,750.0
Senior notes | 2021  
Long-term debt  
Total debt payable 500.0
Senior notes | 2024  
Long-term debt  
Total debt payable 500.0
Senior notes | 2026+  
Long-term debt  
Total debt payable 750.0
Tasiat Mauritamie Ltd. S.A  
Long-term debt  
Total debt payable 200.0
Tasiat Mauritamie Ltd. S.A | 2022  
Long-term debt  
Total debt payable 40.0
Tasiat Mauritamie Ltd. S.A | 2023  
Long-term debt  
Total debt payable 36.0
Tasiat Mauritamie Ltd. S.A | 2024  
Long-term debt  
Total debt payable 32.0
Tasiat Mauritamie Ltd. S.A | 2025  
Long-term debt  
Total debt payable 4.0
Tasiat Mauritamie Ltd. S.A | 2026+  
Long-term debt  
Total debt payable $ 88.0