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Interest in Entities - Summary of Net Assets and Liabilities of the Joint Operation (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2017
Jan. 01, 2016
Dec. 31, 2015
Disclosure of subsidiaries [line items]            
Cash and cash equivalents $ 1,280.9 $ 1,270.8 $ 1,241.5 $ 1,241.5   $ 2,165.5
Current assets 7,071.0 7,079.6 6,823.6 6,823.6 $ 6,447.6  
Non current assets 4,222.3 4,895.0 4,896.2 4,896.2 5,260.1  
Current liabilities 3,028.6 2,803.2 3,227.9 3,227.8 3,147.4  
Non current liabilities 4,324.6 4,993.9 4,555.5 $ 4,555.6 $ 4,741.2  
REVENUE 5,071.1 5,859.4 6,203.9      
Net income (loss) for the year (171.2) 280.0 180.3      
Joint operations [member]            
Disclosure of subsidiaries [line items]            
Cash and cash equivalents 1.3 1.2 1.4      
Current assets 24.5 28.8 27.7      
Non current assets 8.0 7.1 5.4      
Current liabilities 13.1 48.2 24.6      
Non current liabilities 41.5 4.4 25.4      
REVENUE 48.4 42.0 47.4      
Net income (loss) for the year $ (5.4) $ 0.1 $ (9.3)