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CAPITAL AND FINANCIAL RISK MANAGEMENT - Capital management (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Capital and financial risk management    
Long-term debt and credit facilities $ 1,589.9 $ 1,424.2
Current portion of long-term debt and credit facilities 40.0 499.7
Total debt 1,629.9 1,923.9
Common shareholders' equity $ 6,580.9 $ 6,596.5
Total debt/ total debt and common shareholders' equity ratio 19.90% 22.60%
Minimum    
Capital and financial risk management    
Company target 0.00% 0.00%
Maximum    
Capital and financial risk management    
Company target 30.00% 30.00%