Segment information (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Revenues	$ 970.5		$ 928.4	$ 2,669.3	$ 2,747.4
Operating Profit	76.4		52.5	101.6	163.5
Foreign currency transaction gains (losses)				(5.3)	(10.4)
Reportable segments
Segment Reporting Information [Line Items]
Revenues	970.5		924.6	2,669.3	2,743.9
Operating Profit	130.1		130.3	302.1	358.7
Corporate expenses
Segment Reporting Information [Line Items]
General, administrative and other expenses	(26.6)		(26.2)	(78.5)	(85.8)
Foreign currency transaction gains (losses)	(7.9)		(0.4)	(11.5)	0.2
Reconciliation of segment policies to GAAP(a)	4.3		(1.3)	24.1	2.9
Other items not allocated to segments
Segment Reporting Information [Line Items]
Acquisitions and dispositions, Revenues	0.0		(0.2)	0.0	(0.5)
Reorganization and Restructuring	(5.1)		(6.4)	(49.7)	(20.5)
Acquisitions and dispositions, Operating profit	(16.2)		(24.0)	(66.2)	(63.8)
Reporting compliance	0.1		(0.3)	(0.4)	(2.0)
Other items not allocated to segments | Argentina
Segment Reporting Information [Line Items]
Argentina highly inflationary impact	(3.2)		(7.9)	(8.4)	(12.3)
North America | Reportable segments
Segment Reporting Information [Line Items]
Revenues	404.1		446.7	1,197.5	1,323.7
Operating Profit	36.9		38.7	87.8	129.1
South America | Reportable segments
Segment Reporting Information [Line Items]
Revenues	172.0		229.0	528.8	684.5
Operating Profit	38.9		59.4	113.6	147.4
Rest of World | Reportable segments
Segment Reporting Information [Line Items]
Revenues	394.4		248.9	943.0	735.7
Operating Profit	54.3		32.2	100.7	82.2
Internal Loss AR Rebuild
Segment Reporting Information [Line Items]
Revenues			4.0
Internal loss		$ (6.4)	(13.7)	(9.6)
Internal Loss AR Rebuild | Other items not allocated to segments
Segment Reporting Information [Line Items]
Revenues	0.0		4.0	0.0	4.0
Internal loss	$ 0.9		$ (11.3)	$ (9.9)	$ (13.9)