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CAPITAL AND FINANCIAL RISK MANAGEMENT - Capital management (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Capital and financial risk management |  |
Long-term debt | $ 1,732.6 | $ 1,733.2
Total debt | 1,732.6 | 1,733.2
Common shareholders' equity | $ 4,583.6 | $ 4,145.5
Total debt/ total debt and common shareholders' equity ratio | 27.40% | 29.50%
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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