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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%

X

- Definition

The amount of outstanding funds that the entity is obligated to repay.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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- Definition

The amount of equity attributable to the owners of the parent. This specifically excludes non-controlling interest.

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- Definition

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+ References

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- Definition

The target total debt to total debt and common shareholders' equity ratio.

+ References

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- Definition

The percentage of debt to total debt and common shareholders' equity.

+ References

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