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Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of income taxes [line items]        
Differences between basis: account x tax $ 5.1 $ 10.8 $ (28.4)  
Deferred tax assets (liabilities), net 232.4 244.6 253.6 $ 397.4
Components of deferred tax assets and liabilities [Member]        
Disclosure of income taxes [line items]        
Temporarily non-deductibleprovisions 39.7 (76.1) (102.7)  
Tax loss carryforwards 0.5 4.5 28.3  
Functional currency effect of the non monetary assets (323.4) (206.0) (201.0)  
Gains not realized from sales of the Company to subsidiairies 22.7 15.4 16.4  
Effect of differences by fixed asset 7.5 (8.1) (31.2)  
Differences between basis: account x tax 20.6 25.7 36.6  
Deferred tax assets (liabilities), net (232.4) (244.6) (253.6)  
Total deferred tax asset 21.6 13.4 11.6  
Total deferred tax liability $ (254.0) $ (258.0) $ (265.2)