Canadian Customs Duty Examination - Textuals (Details) - CBSA $ in Millions, $ in Millions	1 Months Ended		3 Months Ended		14 Months Ended
	Mar. 31, 2018 USD ($)	Mar. 31, 2018 CAD ($)	Apr. 30, 2019 USD ($)	Apr. 30, 2019 CAD ($)	Apr. 30, 2019 USD ($)	Apr. 30, 2019 CAD ($)
Canadian Customs Duty Examination [Line Items]
Value of bond issued for prepayments of additional duties	$ 20.9	$ 26.9
Deferred higher dutiable value			$ 1.2	$ 1.6	$ 9.2	$ 12.4