XML 108 R78.htm IDEA: XBRL DOCUMENT v3.21.1
CAPITAL AND FINANCIAL RISK MANAGEMENT - Capital management (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Capital and financial risk management    
Long-term debt and credit facilities $ 1,424.2 $ 1,837.4
Current portion of long-term debt and credit facilities 499.7  
Total debt 1,923.9 1,837.4
Common shareholders' equity $ 6,596.5 $ 5,318.5
Total debt/ total debt and common shareholders' equity ratio 22.60% 25.70%
Minimum    
Capital and financial risk management    
Company target 0.00% 0.00%
Maximum    
Capital and financial risk management    
Company target 30.00% 30.00%