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Cash and Cash Equivalents - Schedule of Cash and Cash Equivalents (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
 [1]
Dec. 31, 2016
 [1]
Cash and cash equivalents [abstract]          
Cash at bank and on hand $ 515.0 $ 219.7      
Total cash and cash equivalents $ 515.0 $ 219.7 [1] $ 393.8 $ 393.8 $ 471.0
[1] Refer note 42.