XML 60 R47.htm IDEA: XBRL DOCUMENT v3.10.0.1
Revenue from Contracts with Customers - Summary of Unbilled Receivables, Contract Assets and Contract Liabilities from Contracts with Customers (Detail) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Contract with Customer, Asset and Liability [Abstract]    
Unbilled receivables $ 587.1 $ 415.2
Deferred contract costs 58.9 83.3
Deferred revenue $ 472.7 $ 430.6