XML 60 R49.htm IDEA: XBRL DOCUMENT v3.19.1
Contracts with Customers - Summary of Unbilled Receivables, Contract Assets and Contract Liabilities from Contracts with Customers (Detail) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Contract with Customer, Asset and Liability [Abstract]    
Unbilled receivables $ 767.7 $ 496.2
Deferred contract costs 55.1 91.6
Deferred revenue $ 480.1 $ 457.7