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Share Capital and Employee Compensation Plans - Dividends (Details) - $ / shares
Mar. 05, 2018
Nov. 20, 2017
Aug. 21, 2017
May 23, 2017
Feb. 27, 2017
Nov. 25, 2016
Aug. 23, 2016
May 24, 2016
Feb. 29, 2016
Disclosure of terms and conditions of share-based payment arrangement [line items]                  
Dividends paid (dollars per share)   $ 0.0250 $ 0.0250 $ 0.0250 $ 0.0250 $ 0.0125 $ 0.0125 $ 0.0125 $ 0.0125
Dividends Paid [member]                  
Disclosure of terms and conditions of share-based payment arrangement [line items]                  
Dividends paid (dollars per share) $ 0.0350