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Contracts with Customers - Summary of Unbilled Receivables, Contract Assets and Contract Liabilities from Contracts with Customers (Detail) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Contract with Customer, Asset and Liability [Abstract]    
Unbilled receivables $ 675.5 $ 496.2
Deferred contract costs 64.3 91.6
Deferred revenue $ 493.9 $ 457.7