CONSOLIDATED FINANCIAL STATEMENT DETAILS - Goodwill (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Goodwill
Goodwill	$ 162.7	$ 162.7
Kupol
Goodwill
Goodwill	158.8	158.8
Other Operations
Goodwill
Goodwill	3.9	3.9
Accumulated impairment \| Kupol
Goodwill
Goodwill	668.4	668.4
Accumulated impairment \| Other Operations
Goodwill
Goodwill	$ 0.0	$ 0.0

The amount of assets representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognised. [Refer: Business combinations [member]]

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Balance Type:	debit
Period Type:	instant