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Segmented and geographic information, and major customers (Geographic Information) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Mexican Operations [Member]
Disclosure of operating segments [line items]
Derivative pricing adjustments	$ 29.0	$ 5.0	$ 30.0	$ 13.0
U.S. Operations [Member]
Disclosure of operating segments [line items]
Derivative pricing adjustments	$ 4.0	$ 2.0	$ 5.0	$ 10.0

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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

Derivative pricing adjustments.

+ References

No definition available.

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- Details

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- Details

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