Segment information - Assets, Long Lived Assets, Revenues, Net Assets by Geographic Area (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]
Assets held by Reportable Segment	$ 5,135.6				$ 3,763.8				$ 5,135.6	$ 3,763.8
Long-Lived Assets by Geographic Area	838.2				763.3				838.2	763.3
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
Net assets outside the U.S.	1,976.0				1,260.1				1,976.0	1,260.1
Reportable Segments:
Segment Reporting Information [Line Items]
Assets held by Reportable Segment	4,700.6				3,497.5				4,700.6	3,497.5
Revenues									3,690.9	3,679.7	3,437.5
Corporate items
Segment Reporting Information [Line Items]
Assets held by Reportable Segment	435.0				266.3				435.0	266.3
North America | Reportable Segments:
Segment Reporting Information [Line Items]
Assets held by Reportable Segment	1,327.8				1,355.8				1,327.8	1,355.8
Revenues									1,261.4	1,370.4	1,101.0
Latin America | Reportable Segments:
Segment Reporting Information [Line Items]
Assets held by Reportable Segment	1,029.3				1,133.3				1,029.3	1,133.3
Revenues									1,071.9	1,319.8	1,281.6
Europe | Reportable Segments:
Segment Reporting Information [Line Items]
Assets held by Reportable Segment	1,432.4				636.2				1,432.4	636.2
Revenues									753.8	549.6	612.6
Rest of World | Reportable Segments:
Segment Reporting Information [Line Items]
Assets held by Reportable Segment	911.1				372.2				911.1	372.2
Revenues									603.8	439.9	442.3
Mexico
Segment Reporting Information [Line Items]
Long-Lived Assets by Geographic Area	118.9				129.4				118.9	129.4
Revenues									366.3	412.4	365.3
Net assets outside the U.S.	154.0				181.3				154.0	181.3
France
Segment Reporting Information [Line Items]
Long-Lived Assets by Geographic Area	74.9				74.1				74.9	74.1
Revenues									336.7	373.2	428.5
Net assets outside the U.S.	155.2				155.4				155.2	155.4
Brazil
Segment Reporting Information [Line Items]
Long-Lived Assets by Geographic Area	57.9				72.2				57.9	72.2
Revenues									315.0	440.4	405.4
Net assets outside the U.S.	224.1				274.1				224.1	274.1
ARGENTINA
Segment Reporting Information [Line Items]
Revenues									171.2	214.4	247.2
Net assets outside the U.S.	178.9				166.1				178.9	166.1
Canada
Segment Reporting Information [Line Items]
Long-Lived Assets by Geographic Area	46.2				54.1				46.2	54.1
Revenues									129.8	149.8	151.7
Net assets outside the U.S.	991.5				450.7				991.5	450.7
Other
Segment Reporting Information [Line Items]
Long-Lived Assets by Geographic Area	269.0				150.0				269.0	150.0
Revenues									1,240.3	868.4	941.5
Subtotal
Segment Reporting Information [Line Items]
Long-Lived Assets by Geographic Area	566.9				479.8				566.9	479.8
Revenues									2,559.3	2,458.6	2,539.6
U.S.
Segment Reporting Information [Line Items]
Long-Lived Assets by Geographic Area	271.3				283.5				271.3	283.5
Revenues									1,131.6	1,224.6	$ 949.3
Netherlands
Segment Reporting Information [Line Items]
Net assets outside the U.S.	156.0				0.0				156.0	0.0
Hong Kong
Segment Reporting Information [Line Items]
Net assets outside the U.S.	$ 116.3				$ 32.5				$ 116.3	$ 32.5