Subsequent event (Narrative) (Details) - Subsequent Event [Member] - Joint ventures [Member] shares in Millions, $ in Millions	Feb. 11, 2020 USD ($) shares
Disclosure of non-adjusting events after reporting period [line items]
Distribution received from joint venture \| $	$ 15.0
Preference shares redeemable share subscribed \| shares	159.9

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.

No definition available.

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