XML 182 R175.htm IDEA: XBRL DOCUMENT v3.8.0.1
Commitments - Schedule of Commitments (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Capital expenditure    
Contracted for Operating leases $ 44.5 $ 46.2
Within one year [member]    
Capital expenditure    
Operating lease commitment 66.6 42.5
Later than one and not later than five years [member]    
Capital expenditure    
Operating lease commitment 257.9 229.9
Later than five years [member]    
Capital expenditure    
Operating lease commitment $ 448.0 $ 277.3