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Supplemental Cash Flow information - Summary of Payments Made During Period and Transactions Not Affecting Cash and Cash Equivalents (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Payments made during the period:      
Interest $ 212.7 $ 186.4 $ 175.0
Income tax and social contribution 23.3 28.6 153.9
Non-cash financing and investing transactions      
Impairment of assets (55.2) (58.4)  
Government grants   (4.3) (51.5)
Inventory [member]      
Non-cash financing and investing transactions      
Non-cash additions of property plant and equipment (29.5) (21.6) 2.5
Property, plant and equipment, transfer for providing for the sale of inventory $ (112.7) $ (100.8) (34.8)
Financial guarantees [member]      
Non-cash financing and investing transactions      
Non-cash additions of property plant and equipment     45.7
Intangible assets [member]      
Non-cash financing and investing transactions      
Non-cash additions of property plant and equipment     $ 7.5