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CAPITAL AND FINANCIAL RISK MANAGEMENT - Capital management (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Capital and financial risk management    
Long-term debt and credit facilities $ 2,556.9 $ 1,589.9
Current portion of long-term debt and credit facilities 36.0 40.0
Total debt 2,592.9 1,629.9
Common shareholders' equity $ 5,823.7 $ 6,580.9
Total debt/ total debt and common shareholders' equity ratio 30.80% 19.90%
Minimum    
Capital and financial risk management    
Company target 0.00% 0.00%
Maximum    
Capital and financial risk management    
Company target 30.00% 30.00%