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Revolving term credit facilities (Details) $ in Millions		3 Months Ended	6 Months Ended
	Mar. 20, 2017 USD ($) item	Mar. 31, 2018 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)
Credit Facility
Revolving term credit facility
Term of credit facility			5 years
Maximum borrowing capacity			$ 1,000.0
Amount outstanding			0.0	$ 0.0
Debt issuance costs capitalised			$ 2.7	2.5
Credit Facility | Bottom
Revolving term credit facility
Bankers acceptance period under credit facility			30 days
Stamping fee (as a percent)			1.10%
Standby fee (as a percent)			0.22%
Credit Facility | Top
Revolving term credit facility
Bankers acceptance period under credit facility			180 days
Stamping fee (as a percent)			2.20%
Standby fee (as a percent)			0.44%
Credit Facility | CIBC | Bottom
Revolving term credit facility
Spread on variable rate (as a percent)			0.10%
Credit Facility | CIBC | Top
Revolving term credit facility
Spread on variable rate (as a percent)			1.20%
Credit Facility | LIBOR | Bottom
Revolving term credit facility
Spread on variable rate (as a percent)			1.10%
Credit Facility | LIBOR | Top
Revolving term credit facility
Spread on variable rate (as a percent)			2.20%
Credit Facility | Prime rate | Bottom
Revolving term credit facility
Spread on variable rate (as a percent)			0.10%
Credit Facility | Prime rate | Top
Revolving term credit facility
Spread on variable rate (as a percent)			1.20%
FNBC Credit Facility
Revolving term credit facility
Maturity period	1 year
Maximum borrowing capacity	$ 100.0
Proceeds from draw of Credit Facility		$ 20.0
Repayment of credit facility		$ 20.0
Amount outstanding			$ 0.0	0.0
Number of additional extensions available | item	1
Extension period available	1 year
Debt issuance costs capitalised			$ 0.1	$ 0.1

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- Definition

Bankers acceptance period.

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No definition available.

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X

- Definition

Period of time between issuance and maturity of debt instrument.

+ References

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X

- Definition

The additional extension period available under contract.

+ References

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- Definition

The amount of finance costs recorded on the balance sheet as of end of period.

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- Definition

Number of additional extensions available under contract.

+ References

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- Definition

Stamping fee as a percent.

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- Definition

The standby fee in percent.

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- Definition

Term of credit facility.

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No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
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-IssueDate 2017-01-01
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- Definition

The adjustment to the basis (reference rate) used for calculation of the interest rate on borrowings. [Refer: Borrowings]

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

The cash inflow from non-current borrowings obtained. [Refer: Borrowings]

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- Definition

The cash outflow for repayments of non-current borrowings. [Refer: Borrowings]

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X

- Definition

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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