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Subsequent event	12 Months Ended
Subsequent event	Dec. 31, 2018
Subsequent Events [Abstract]
Subsequent event	Subsequent event Normal course issuer bid On January 29, 2019, the Board of Directors of the Company approved a new NCIB, which allows for the repurchase of up to 22 million common shares between February 1, 2019 and January 31, 2020, at prevailing market prices plus brokerage fees, or such other prices as may be permitted by the Toronto Stock Exchange.