Segment information - Revenue And Operating Profits (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Revenues	$ 788.4	$ 721.8
Operating Profit	70.9	23.5
Reportable segments
Segment Reporting Information [Line Items]
Revenues	740.3	688.9
Operating Profit	74.2	45.8
Corporate expenses
Segment Reporting Information [Line Items]
General, administrative and other expenses	(19.2)	(17.6)
Foreign currency transaction gains (losses)	(1.2)	1.3
Reconciliation of segment policies to GAAP	(0.9)	3.2
Other items not allocated to segments
Segment Reporting Information [Line Items]
Acquisitions and dispositions, Revenues	0.0	0.8
Reorganization and Restructuring	(4.1)	(6.0)
Acquisitions and dispositions, Operating profit	1.0	(5.9)
Other items not allocated to segments | Venezuela operations
Segment Reporting Information [Line Items]
Revenues	48.1	32.1
Operating Profit	21.1	2.7
North America | Reportable segments
Segment Reporting Information [Line Items]
Revenues	304.6	292.7
Operating Profit	10.2	3.7
South America | Reportable segments
Segment Reporting Information [Line Items]
Revenues	202.2	157.0
Operating Profit	38.7	23.7
Rest of World | Reportable segments
Segment Reporting Information [Line Items]
Revenues	233.5	239.2
Operating Profit	$ 25.3	$ 18.4