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CAPITAL AND FINANCIAL RISK MANAGEMENT - Capital management (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
CAPITAL AND FINANCIAL RISK MANAGEMENT    
Long-term debt $ 1,235.5 $ 2,232.6
Current portion of long-term debt 199.9  
Total debt 1,435.4 2,232.6
Common shareholders' equity $ 6,861.6 $ 6,083.7
Total debt/ total debt and common shareholders' equity ratio 17.30% 26.80%
Minimum    
CAPITAL AND FINANCIAL RISK MANAGEMENT    
Company target 0.00% 0.00%
Maximum    
CAPITAL AND FINANCIAL RISK MANAGEMENT    
Company target 30.00% 30.00%