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Income Taxes - Changes in Deferred Income Tax (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of income taxes [line items]      
Beginning balance $ (244.6) $ (253.6) $ (397.4)
Temporarily non-deductible provisions 115.8 26.6 (99.9)
Tax loss carryforwards (4.0) (23.8) 7.8
Functional currency effect of the non monetary assets (117.4) (5.0) 206.1
Gains not realized from sales of Parent Company to subsidiairies 7.3 (1.0) (3.5)
Effect of differences by fixed asset 15.6 23.0 4.9
Differences between basis: account x tax (5.1) (10.8) 28.4
Ending balance (232.4) (244.6) (253.6)
From the statement of income [member]      
Disclosure of income taxes [line items]      
Beginning balance (279.5) (292.4) (429.9)
Temporarily non-deductible provisions 115.8 26.6 (99.9)
Tax loss carryforwards (4.0) (23.8) 7.8
Functional currency effect of the non monetary assets (117.4) (5.0) 206.1
Gains not realized from sales of Parent Company to subsidiairies 7.3 (1.0) (3.5)
Effect of differences by fixed asset 15.6 23.0 4.9
Differences between basis: account x tax 3.9 (6.9) 22.1
Ending balance (258.3) (279.5) (292.4)
Other comprehensive income [member]      
Disclosure of income taxes [line items]      
Beginning balance 34.9 38.8 32.5
Differences between basis: account x tax (9.0) (3.9) 6.3
Ending balance $ 25.9 $ 34.9 $ 38.8