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Cash and Cash Equivalents - Schedule of Cash and Cash Equivalents (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
 [2]
Dec. 31, 2014
 [2]
Cash and cash equivalents [abstract]        
Cash at bank and on hand $ 479.0 $ 526.7    
Total cash and cash equivalents $ 479.0 $ 526.7 [1],[2] $ 440.0 $ 458.0
[1] As Restated - Refer note 40 for further details.
[2] The restatement is as a result of the discontinued operations.