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Decommissioning Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of changes in other provisions [abstract]
Acquisitions through business combinations, other provisions	$ 2.4
Provision for decommissioning, restoration and rehabilitation costs [member]
Reconciliation of changes in other provisions [abstract]
Beginning balance	39.6	$ 37.2
Reclamation expenditures	(0.1)	(0.3)
Accretion expense	2.6	2.1
Revisions to expected discounted cash flows	0.1	0.6
Ending balance	$ 44.6	$ 39.6

X

- Definition

The increase in other provisions resulting from acquisitions through business combinations. [Refer: Business combinations [member]; Other provisions]

+ References

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- Definition

The increase (decrease) in other provisions resulting from a change in discount rate. [Refer: Other provisions]

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