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Contracts with Customers - Additional Information (Detail) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Revenue From Contract With Customer [Abstract]      
Remaining performance obligations $ 531.4    
Deferred contract costs 69.6 $ 98.3  
Amortization of deferred contract costs $ 304.0   $ 277.2