Supplemental cash flow information (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Schedule of Trading Securities and Other Trading Assets [Line Items]
Interest	$ 19.8	$ 15.8
Income taxes, net	64.9	55.3
Capital Lease Arrangements Incurred	33.4	$ 18.9
Restricted cash	85.7		$ 55.5
Cash from Short Term Borrowings
Schedule of Trading Securities and Other Trading Assets [Line Items]
Restricted cash	24.8		22.3
Cash Held From Customers
Schedule of Trading Securities and Other Trading Assets [Line Items]
Restricted cash	52.6		$ 33.2
Deposit liability
Schedule of Trading Securities and Other Trading Assets [Line Items]
Restricted cash	$ 8.3

The increase during the period in capital lease obligations due to entering into new capital leases.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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