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Revenue (Expenses) by Type - Summary of Revenue Expenses (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Revenue Expenses By Type [abstract]      
REVENUE $ 5,071.1 $ 5,859.4 $ 6,203.9
Cost of sales and services (4,303.1) (4,764.1) (4,982.0)
Administrative (182.6) (179.1) (164.3)
Selling (304.2) (315.9) (353.4)
Research (46.1) (49.2) (47.6)
Other income (expenses), net (199.4) (210.4) (442.6)
Equity in losses on associates (0.4) 1.2 (0.3)
Operating profit before financial income 35.3 341.9 213.7
Revenue (expenses) by nature:      
Revenue from sales of goods 4,450.5 5,023.6 5,404.7
Revenue from sales of services 676.5 920.6 880.8
Sales deductions and tax on revenue (55.9) (84.8) (81.6)
General manufacturing costs (4,031.1) (4,421.4) (4,613.6)
Depreciation (159.2) (196.5) (194.5)
Amortization (112.8) (146.2) (173.9)
Personnel expenses (245.8) (245.4) (261.6)
Selling expenses (42.7) (53.8) (83.6)
Provision for penalties   (10.1) (228.0)
Restructuring expenses   (6.4) (117.3)
Miscellaneous (444.2) (437.7) (317.7)
Operating profit before financial income $ 35.3 $ 341.9 $ 213.7