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Summary of Information about Receivables, Net of Allowance (Detail) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Contract With Customer Asset And Liability [Abstract]    
Receivables $ 1,790.3 $ 1,703.0
Allowance at beginning of period (6.3) (4.2)
Net decrease/(increase) of allowance 0.5 (1.8)
Translation difference 0.0 (0.3)
Allowance at end of period (5.8) (6.3)
Receivables, net of allowance $ 1,784.5 $ 1,696.7