Canadian Customs Duty Examination - Textuals (Details) $ in Millions, $ in Millions	1 Months Ended		9 Months Ended
	Mar. 31, 2018 CAD ($)	Mar. 31, 2018 USD ($)	Oct. 31, 2019 CAD ($)	Oct. 31, 2019 USD ($)
Canadian Customs Duty Examination [Line Items]
Deferred higher dutiable value			$ 2.2	$ 1.7
CBSA
Canadian Customs Duty Examination [Line Items]
Value of bond issued for prepayments of additional duties	$ 26.9	$ 20.9
Deferred higher dutiable value			$ 12.7	$ 9.7