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Segment information - Narrative (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			3 Months Ended	1 Months Ended
	Dec. 31, 2014 headcounts locations	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2014	Mar. 31, 2014	Feb. 28, 2013
Segment Reporting Information [Line Items]
Number of Countries in which Entity Operates	100
Number of Countries In Which Entity Operate Subsidiaries	41
2014 Reorganization and Restructuring Costs [Abstract]
Number of Positions Eliminated	1,700
Severance costs	$ 21.8us-gaap_SeveranceCosts1
Acquisitions and disposition [Abstract]
Share of earnings of unconsolidated equity affiliates	4.3	6.7	6.0
Business Acquisitions 2010 Mexico [Member]
Acquisitions and disposition [Abstract]
Business Acquisition Adjustments	0.7	(1.1)	2.1
Acquisitions 2013 Rede Trel Brazil [Member]
Acquisitions and disposition [Abstract]
Business Acquisition Adjustments		1.7
India Acquisitions 2009 [Member]
Acquisitions and disposition [Abstract]
Impairment Of Intangible Assets		0.9
Other Acquisitions Dispositions [Member]
Acquisitions and disposition [Abstract]
Divestiture of Equity Investment	0.6
Business Acquisition Adjustments			(0.5)
CIT Business Peru [Member]
Acquisitions and disposition [Abstract]
Divestiture of Equity Investment	44.3
Share of earnings of unconsolidated equity affiliates	3.8	6.1	5.8
Carrying value of equity investment		13.5	13.8
Venezuela [Member]
Segment Reporting Information [Line Items]
Net remeasurement loss		13.4		121.6
Acquisitions and disposition [Abstract]
Gain (Loss) on Disposition of Real Estate			7.2
Venezuelan Bolivar Fuerte [Member]
Segment Reporting Information [Line Items]
Net remeasurement loss	121.6	13.4
Change in currency rate					88.00%	16.00%
Venezuelan Bolivar Fuerte [Member] \| Minimum [Member]
Segment Reporting Information [Line Items]
Foreign Currency Exchange Rate to the US dollar, Remeasurement				6.3	6.3	5.3
Venezuelan Bolivar Fuerte [Member] \| Minimum [Member] \| Venezuela [Member]
Segment Reporting Information [Line Items]
Foreign Currency Exchange Rate to the US dollar, Remeasurement			5.3
Venezuelan Bolivar Fuerte [Member] \| Maximum [Member]
Segment Reporting Information [Line Items]
Foreign Currency Exchange Rate to the US dollar, Remeasurement				50	50	6.3
Monetary Assets Rate - Bolivar [Member] \| Venezuela [Member]
Segment Reporting Information [Line Items]
Net remeasurement loss	121.6	13.4
Nonmonetary Assets Rate - Bolivar [Member] \| Venezuela [Member]
Segment Reporting Information [Line Items]
Net remeasurement loss	$ 21.1	$ 1.2