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Segment information - Narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
Country
Segment
Region
business_unit
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Segment Reporting Information [Line Items]      
Number of business units | business_unit 2    
Number of operating segments | Segment 9    
Number of countries within Largest 5 Markets | Country 5    
Number of regions with Global Markets | Region 3    
Number of countries in which the entity operates | Country 100    
Share in earnings of equity affiliates | $ $ 0.5 $ 4.3 $ 6.7
CIT Business Peru      
Segment Reporting Information [Line Items]      
Carrying value | $     13.5
Share in earnings of equity affiliates | $   $ 3.8 $ 6.1
Subsidiaries      
Segment Reporting Information [Line Items]      
Number of countries in which the entity operates | Country 41