Segment information - Capital Expenditures, Depreciation, Amortization (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Capital Expenditures by Reportable Segment	$ 48.8	$ 42.9	$ 37.9	$ 35.2	$ 51.1	$ 30.7	$ 36.6	$ 36.7	$ 164.8	$ 155.1	$ 174.5
Depreciation and Amortization by Reportable Segment									157.2	144.6	138.2
Amortization of intangible assets:									27.8	17.7	8.4
Total	$ 45.5	$ 42.9	$ 48.7	$ 47.9	$ 42.8	$ 41.6	$ 39.1	$ 38.8	185.0	162.3	146.6
Reportable Segments:
Segment Reporting Information [Line Items]
Capital Expenditures by Reportable Segment									154.5	140.3	161.4
Depreciation and Amortization by Reportable Segment									141.3	129.7	122.3
Reportable Segments: | North America
Segment Reporting Information [Line Items]
Capital Expenditures by Reportable Segment									76.6	59.1	86.3
Depreciation and Amortization by Reportable Segment									81.1	72.1	68.4
Reportable Segments: | South America
Segment Reporting Information [Line Items]
Capital Expenditures by Reportable Segment									44.4	43.3	39.2
Depreciation and Amortization by Reportable Segment									27.9	26.3	23.5
Reportable Segments: | Rest of World
Segment Reporting Information [Line Items]
Capital Expenditures by Reportable Segment									33.5	37.9	35.9
Depreciation and Amortization by Reportable Segment									32.3	31.3	30.4
Corporate items
Segment Reporting Information [Line Items]
Capital Expenditures by Reportable Segment									10.3	14.8	8.9
Depreciation and Amortization by Reportable Segment									10.8	11.9	12.0
Other items not allocated to segments:
Segment Reporting Information [Line Items]
Depreciation and Amortization by Reportable Segment									3.1
Venezuela | Other items not allocated to segments:
Segment Reporting Information [Line Items]
Capital Expenditures by Reportable Segment									0.0	0.0	4.2
Depreciation and Amortization by Reportable Segment									0.0	1.1	1.7
ARGENTINA | Other items not allocated to segments:
Segment Reporting Information [Line Items]
Depreciation and Amortization by Reportable Segment									1.8
Reorganization and Restructuring | Other items not allocated to segments:
Segment Reporting Information [Line Items]
Depreciation and Amortization by Reportable Segment									$ 0.2	$ 1.9	$ 2.2