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Finance Costs	12 Months Ended
Finance Costs	Dec. 31, 2018
Borrowing costs [abstract]
Finance cost	Finance costs: Finance costs are primarily comprised of interest on borrowings and finance lease obligations, amortization of deferred financing fees and accretion expense associated with site restoration costs. Finance costs were $94.4 million for the year ended December 31, 2018 (2017 - $95.0 million).