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CAPITAL AND FINANCIAL RISK MANAGEMENT - Capital management (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Capital and financial risk management |  |
Long-term debt and credit facilities | $ 1,837.4 | $ 1,735.0
Total debt | 1,837.4 | 1,735.0
Common shareholders' equity | $ 5,318.5 | $ 4,506.7
Total debt/ total debt and common shareholders' equity ratio | 25.70% | 27.80%
Minimum |  |
Capital and financial risk management |  |
Company target | 0.00% | 0.00%
Maximum |  |
Capital and financial risk management |  |
Company target | 30.00% | 30.00%

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