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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash and cash equivalents [Line Items]          
Cash and banks $ 125.4 $ 383.4      
Cash 125.4 383.4      
Cash equivalents          
Cash equivalents 1,155.5 887.4      
Cash and cash equivalents 1,280.9 1,270.8 $ 1,241.5 $ 1,241.5 $ 2,165.5
Private securities [member]          
Cash equivalents          
Cash equivalents 352.6 219.4      
Fixed deposits [member]          
Cash equivalents          
Cash equivalents $ 802.9 $ 668.0