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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Allowance for Doubtful Accounts [Abstract]        
Accounts Receivable, Allowance for Credit Loss $ 24.8 $ 26.0 $ 26.6 $ 19.0
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease) 0.6 10.3    
Accounts Receivable, Allowance for Credit Loss, Writeoff $ (2.4) $ (3.4)