XML 337 R149.htm IDEA: XBRL DOCUMENT v3.19.1
Financial Instruments - Summary of Company's Cash, Cash Equivalents, Financial Investments and Loans and Financing (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure Of Cash Cash Equivalents Financing Investments And Loans And Financing [line items]          
Total amount $ 3,647.6 $ 4,198.5 $ 3,759.9 $ 3,759.9 $ 4,229.9
Without the effect of derivative transactions [member]          
Disclosure Of Cash Cash Equivalents Financing Investments And Loans And Financing [line items]          
Pre-fixed amount $ 2,742.3        
Pre-fixed percentage 85.49%        
Post-fixed amount $ 465.5        
Post-fixed percentage 14.51%        
Total amount $ 3,207.8        
Total percentage 100.00%        
Pre-fixed amount   $ 3,577.7      
Pre-fixed percentage   98.09%      
Post-fixed amount $ 69.9 $ 69.8      
Post-fixed percentage 100.00% 1.91%      
Total amount   $ 3,647.5      
Total percentage   100.00%      
With the effect of derivative transactions [member]          
Disclosure Of Cash Cash Equivalents Financing Investments And Loans And Financing [line items]          
Pre-fixed amount $ 2,742.3        
Pre-fixed percentage 85.49%        
Post-fixed amount $ 465.5        
Post-fixed percentage 14.51%        
Total amount $ 3,207.8        
Total percentage 100.00%        
Pre-fixed amount   $ 3,194.3      
Pre-fixed percentage   87.57%      
Post-fixed amount $ 453.4 $ 453.3      
Post-fixed percentage 100.00% 12.43%      
Total amount   $ 3,647.6      
Total percentage   100.00%