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Significant accounting policies - Other (Details) $ in Millions	Jan. 02, 2018 USD ($)	Jan. 01, 2018 USD ($) item
Significant accounting policies
Impact on adoption of IFRS 9	$ 27.1
Number of equity investments accounted for at cost | item		1
Carrying value		$ 4.0
Number of loan receivable carried at amortized cost | item		1
Loan receivable at amortized cost		$ 30.1

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- Definition

Amount after tax of changes in equity or changes in net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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Carrying value of investments designated as held at cost.

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Value of loan receivable at amortized cost.

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The number of equity investments accounted for at cost.

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The number of loan receivable accounted for at amortized cost.

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