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Segment information - Narrative (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended	3 Months Ended
	Dec. 31, 2014 employees	Mar. 31, 2015	Mar. 31, 2014	Feb. 28, 2015
Latin American And EMEA Regions [Member]
2014 Reorganization and Restructuring Costs [Abstract]
Number of Positions Eliminated	1,700.0
Severance costs	$ 21.8
Severance and lease terminations	1.5
Venezuela [Member]
Segment Reporting Information [Line Items]
Net remeasurement loss		$ (18.0)	$ (121.9)
Venezuelan Bolivar Fuerte [Member] \| Venezuela [Member]
Segment Reporting Information [Line Items]
Foreign Currency Exchange Rate to the US dollar, Remeasurement			6.3
Venezuelan Bolivar Fuerte [Member] \| Minimum [Member]
Segment Reporting Information [Line Items]
Foreign Currency Exchange Rate to the US dollar, Remeasurement			6.3	52
Venezuelan Bolivar Fuerte [Member] \| Maximum [Member]
Segment Reporting Information [Line Items]
Foreign Currency Exchange Rate to the US dollar, Remeasurement			50	170.0