Segment information - Revenue And Operating Profits (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Revenues	$ 1,021.6	$ 970.5	$ 826.0	$ 872.8	$ 935.8	$ 928.4	$ 914.0	$ 905.0	$ 3,690.9	$ 3,683.2	$ 3,488.9
Operating Profit	$ 111.9	$ 76.4	$ (1.0)	$ 26.2	73.3	52.5	$ 52.6	$ 58.4	213.5	236.8	274.7
Foreign currency transaction losses									(11.2)	(22.9)	(13.9)
Reportable Segments:
Segment Reporting Information [Line Items]
Revenues									3,690.9	3,679.7	3,437.5
Operating Profit									493.6	519.3	442.9
Corporate items:
Segment Reporting Information [Line Items]
General, administrative and other expenses									(116.3)	(123.2)	(99.4)
Foreign currency transaction losses									(6.5)	(4.8)	(2.2)
Reconciliation of segment policies to GAAP									10.5	0.3	5.6
Other items not allocated to segments:
Segment Reporting Information [Line Items]
Acquisitions and dispositions, revenues									0.0	(0.5)	0.0
Reorganization and Restructuring									(66.6)	(28.8)	(20.6)
Acquisitions and dispositions									(83.1)	(88.5)	(41.4)
Reporting compliance									(0.5)	(2.1)	(4.5)
Venezuela | Other items not allocated to segments:
Segment Reporting Information [Line Items]
Revenues									0.0	0.0	51.4
Operating Profit									0.0	0.0	2.3
ARGENTINA
Segment Reporting Information [Line Items]
Revenues									171.2	214.4	247.2
ARGENTINA | Other items not allocated to segments:
Segment Reporting Information [Line Items]
Argentina highly inflationary impact									(10.7)	(14.5)	(8.0)
North America | Reportable Segments:
Segment Reporting Information [Line Items]
Revenues									1,261.4	1,370.4	1,101.0
Operating Profit									91.7	104.1	70.9
Latin America | Reportable Segments:
Segment Reporting Information [Line Items]
Revenues									1,071.9	1,319.8	1,281.6
Operating Profit									233.6	296.9	254.9
Europe | Reportable Segments:
Segment Reporting Information [Line Items]
Revenues									753.8	549.6	612.6
Operating Profit									51.2	42.6	43.0
Rest of World | Reportable Segments:
Segment Reporting Information [Line Items]
Revenues									603.8	439.9	442.3
Operating Profit									117.1	75.7	$ 74.1
Internal Loss AR Rebuild
Segment Reporting Information [Line Items]
Revenues						4.0
Internal loss					$ (6.4)	$ (13.7)			(6.6)
Internal Loss AR Rebuild | Other items not allocated to segments:
Segment Reporting Information [Line Items]
Revenues									0.0	4.0
Internal loss									$ (6.9)	$ (20.9)