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Contracts with Customers - Summary of Unbilled Receivables, Contract Assets and Contract Liabilities from Contracts with Customers (Detail) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Contract With Customer Asset And Liability [Abstract]    
Unbilled receivables $ 911.1 $ 603.1
Deferred contract costs 65.4 102.0
Deferred revenue $ 590.7 $ 541.3