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Contracts with Customers - Summary of Unbilled Receivables, Contract Assets and Contract Liabilities from Contracts with Customers (Detail) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Contract With Customer Asset And Liability [Abstract]    
Unbilled receivables $ 736.7 $ 556.4
Deferred contract costs 70.1 98.3
Deferred revenue $ 519.6 $ 503.8