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CAPITAL AND FINANCIAL RISK MANAGEMENT - Capital management (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
CAPITAL AND FINANCIAL RISK MANAGEMENT    
Long-term debt and credit facilities $ 2,232.6 $ 2,556.9
Current portion of long-term debt and credit facilities   36.0
Total debt 2,232.6 2,592.9
Common shareholders' equity $ 6,083.7 $ 5,823.7
Total debt/ total debt and common shareholders' equity ratio 26.80% 30.80%
Minimum    
CAPITAL AND FINANCIAL RISK MANAGEMENT    
Company target 0.00% 0.00%
Maximum    
CAPITAL AND FINANCIAL RISK MANAGEMENT    
Company target 30.00% 30.00%