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Supplemental cash flow information (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Condensed Cash Flow Statements, Captions [Line Items]
Interest	$ 40.9	$ 40.9
Income taxes, net	42.8	31.9
Financing Leases	19.4	30.5
Restricted cash	171.5		$ 158.0
Cash and cash equivalents	531.3		311.0
Cash, Cash Equivalents, and Restricted Cash	702.8	$ 410.7	469.0	$ 479.5
Cash from Short Term Borrowings
Condensed Cash Flow Statements, Captions [Line Items]
Restricted cash	10.3		10.3
Cash Held From Customers
Condensed Cash Flow Statements, Captions [Line Items]
Restricted cash	87.4		100.3
Deposits liability
Condensed Cash Flow Statements, Captions [Line Items]
Restricted cash	67.8		$ 47.4
Revolving Credit Facility
Condensed Cash Flow Statements, Captions [Line Items]
Restricted cash	$ 5.0