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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%

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