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Subsequent Event	12 Months Ended
Subsequent Event	Dec. 31, 2018
Subsequent Events [Abstract]
Subsequent Event	25. SUBSEQUENT EVENT Normal Course Issuer Bid Subsequent to December 31, 2018, the Company purchased 3,216,363 Common Shares for cancellation and 76,119 Common Shares to satisfy stock-based compensation awards, each under an existing normal course issuer bid for cash consideration of $168 million.