Segment information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Revenues	$ 914.0	$ 849.7	$ 1,819.0	$ 1,728.8
Operating Profit	52.6	61.7	111.0	126.5
Foreign currency transaction gains (losses)			(3.4)	2.2
Reportable segments
Segment Reporting Information [Line Items]
Revenues	914.3	824.1	1,819.3	1,677.4
Operating Profit	117.6	98.4	228.4	200.2
Corporate expenses
Segment Reporting Information [Line Items]
General, administrative and other expenses	(32.5)	(20.9)	(59.6)	(52.0)
Foreign currency transaction gains (losses)	(0.3)	(1.7)	0.6	(2.2)
Reconciliation of segment policies to GAAP	4.0	0.4	4.2	1.7
Other items not allocated to segments
Segment Reporting Information [Line Items]
Acquisitions and dispositions, Revenues	(0.3)	0.0	(0.3)	0.0
Reorganization and Restructuring	(10.6)	(4.5)	(14.1)	(8.2)
Acquisitions and dispositions, Operating profit	(22.6)	(7.4)	(39.8)	(13.9)
Reporting compliance	(2.9)	(1.4)	(4.3)	(1.4)
Other items not allocated to segments | Venezuela operations
Segment Reporting Information [Line Items]
Revenues	0.0	25.6	0.0	51.4
Operating Profit	0.0	(1.2)	0.0	2.3
Other items not allocated to segments | Argentina
Segment Reporting Information [Line Items]
Argentina highly inflationary impact	(0.1)		(4.4)
North America | Reportable segments
Segment Reporting Information [Line Items]
Revenues	442.5	324.0	877.0	644.1
Operating Profit	46.4	26.1	90.4	46.7
South America | Reportable segments
Segment Reporting Information [Line Items]
Revenues	225.2	233.3	455.5	488.1
Operating Profit	45.0	46.1	88.0	101.7
Rest of World | Reportable segments
Segment Reporting Information [Line Items]
Revenues	246.6	266.8	486.8	545.2
Operating Profit	$ 26.2	$ 26.2	$ 50.0	$ 51.8