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DEBT - Schedule of debt repayments (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Long-term Debt    
2023 $ 160.0  
Thereafter 1,150.0  
Principal amounts repayable 1,310.0  
Debt issuance cost (5.5)  
Unamortized discount on notes (6.0)  
Total debt outstanding $ 1,298.5 $ 1,203.9