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Contracts with Customers - Additional Information (Detail) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Revenue From Contract With Customer [Abstract]      
Remaining performance obligations $ 592.1    
Deferred contract costs 80.7 $ 102.0  
Amortization of deferred contract costs $ 221.6   $ 208.1