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Contracts with Customers - Additional Information (Detail) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Revenue From Contract With Customer [Abstract]      
Remaining performance obligations $ 588.2    
Deferred contract costs 76.3 $ 102.0  
Amortization of deferred contract costs $ 328.5   $ 304.0