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Segment information - Information About Unconsolidated Equity Affiliates (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]      
Carrying value of investments at year end $ 4.9 $ 4.0 $ 3.5
Undistributed earnings 3.5 2.6 2.5
Share in earnings (losses) of equity affiliates 1.9 0.4 $ (1.5)
BGS Business, Belgium      
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]      
Impairment charge   $ 1.8  
Rest of World | Reportable Segments      
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]      
Carrying value of investments at year end 4.2    
Undistributed earnings 2.8    
Share in earnings (losses) of equity affiliates 0.9    
South America | Reportable Segments      
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]      
Carrying value of investments at year end 0.7    
Undistributed earnings 0.7    
Share in earnings (losses) of equity affiliates $ 1.0