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Foreign Exchange Gains (Losses), Net - Schedule of Foreign Exchange Gains (Losses), Net (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Assets:      
Advances to suppliers   $ (1.3)  
Tax credits $ (30.9) (2.2) $ 28.5
Trade accounts receivable and contract assets (24.6) (38.8) 14.6
Cash and cash equivalents and financial investments (80.8) (4.0) 204.2
Other (25.6) (0.4) 47.5
Total Assets (161.9) (46.7) 294.8
Liabilities:      
Loans and financing 82.7 6.0 (153.3)
Advances from customers [1]   25.1 (46.3)
Provisions 24.3 3.8 (27.6)
Taxes and charges payable 13.0 1.6 (21.2)
Accounts payable 17.4 6.8 (18.8)
Suppliers 2.7 0.1 (11.7)
Provisions for contingencies 3.3 (1.3) (3.2)
Deferred taxes (1.3) (1.4) 0.4
Other (0.9)   (0.5)
Total Liabilities 141.2 40.7 (282.2)
Net monetary and foreign exchange variations (20.7) (6.0) 12.6
Derivative instruments $ 20.7 12.6 (8.2)
Foreign exchange gain (loss), net   $ 6.6 $ 4.4
[1] See note to 2.2.1(c) for IFRIC 22 adoption discussions.