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DEBT - Debt repayments (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Long-term Debt    
2023 $ 160.0  
Thereafter 1,450.0  
Principal amounts repayable 1,610.0  
Debt issuance costs (9.7)  
Unamortized discounts on notes (6.7)  
Total debt outstanding $ 1,593.6 $ 1,299.3