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Segment information - Narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
country
segment
region
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Segment Reporting Information [Line Items]      
Number of countries in which the entity operates | country 100    
Number of operating segments | segment 9    
Number of countries within Largest 5 Markets | country 5    
Number of regions with Global Markets | region 3    
Share in earnings of equity affiliates | $ $ (1.5) $ 0.5 $ 4.3
CIT Business Peru      
Segment Reporting Information [Line Items]      
Share in earnings of equity affiliates | $     $ 3.8
Subsidiaries      
Segment Reporting Information [Line Items]      
Number of countries in which the entity operates | country 40    
BGS Business, Belgium      
Segment Reporting Information [Line Items]      
Impairment charge | $ $ 1.8