Segment information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Revenues	$ 905.0	$ 879.1
Operating Profit	58.4	64.8
Foreign currency transaction gains (losses)	(3.9)	2.8
Reportable segments
Segment Reporting Information [Line Items]
Revenues	905.0	853.3
Operating Profit	110.8	101.8
Corporate expenses
Segment Reporting Information [Line Items]
General, administrative and other expenses	(27.1)	(31.1)
Foreign currency transaction gains (losses)	0.9	(0.5)
Reconciliation of segment policies to GAAP	0.2	1.3
Other items not allocated to segments
Segment Reporting Information [Line Items]
Acquisitions and dispositions, Revenues	0.0	0.0
Reorganization and Restructuring	(3.5)	(3.7)
Acquisitions and dispositions, Operating profit	(17.2)	(6.5)
Reporting compliance	(1.4)
Other items not allocated to segments | Venezuela operations
Segment Reporting Information [Line Items]
Revenues	0.0	25.8
Operating Profit	0.0	3.5
Other items not allocated to segments | Argentina
Segment Reporting Information [Line Items]
Argentina highly inflationary impact	(4.3)
North America | Reportable segments
Segment Reporting Information [Line Items]
Revenues	434.5	320.1
Operating Profit	44.0	20.6
South America | Reportable segments
Segment Reporting Information [Line Items]
Revenues	230.3	254.8
Operating Profit	43.0	55.6
Rest of World | Reportable segments
Segment Reporting Information [Line Items]
Revenues	240.2	278.4
Operating Profit	$ 23.8	$ 25.6