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Supplemental cash flow information (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Condensed Cash Flow Statements, Captions [Line Items]
Interest	$ 54.1	$ 56.0
Income taxes, net	42.9	33.4
Argentina conversion losses	(5.3)	(10.4)
Financing Leases	24.3	46.2
Restricted cash	203.0		$ 158.0
Cash and cash equivalents	592.4		311.0
Cash, Cash Equivalents, and Restricted Cash	795.4	$ 426.2	469.0	$ 479.5
Cash from Short Term Borrowings
Condensed Cash Flow Statements, Captions [Line Items]
Restricted cash			10.3
Cash Held From Customers
Condensed Cash Flow Statements, Captions [Line Items]
Restricted cash	93.3		100.3
Deposits liability
Condensed Cash Flow Statements, Captions [Line Items]
Restricted cash	102.3		$ 47.4
Revolving Credit Facility
Condensed Cash Flow Statements, Captions [Line Items]
Restricted cash	$ 5.0