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LONG-TERM DEBT AND CREDIT FACILITIES - Other (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Long-term debt
Long-term debt and credit facilities	$ 1,837.4	$ 1,735.0
Operations in Brazil, Mauritania, Ghana and Chile
Long-term debt
Surety bonds	$ 184.7	161.5
Fees incured (as a percentage)	0.70%
Letter of Credit guarantee facility
Long-term debt
Maximum borrowing capacity	$ 300.0
Borrowings, maturity	June 30, 2020
Long-term debt and credit facilities	$ 227.8	227.4
Fees incured (as a percentage)	0.95%
Surety bonds
Long-term debt
Surety bonds	$ 276.5	$ 264.4
Fees incured (as a percentage)	0.65%

X

- Definition

The amount of bonds issued by the entity.

+ References

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

- Definition

The maturity of borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2019-01-01
-Paragraph 7
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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.

+ References

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- Definition

The non-current portion of non-current borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Number 1
-IssueDate 2019-01-01
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-URIDate 2019-03-27

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- Definition

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+ References

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- Definition

The Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

No definition available.

+ Details

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- Details

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