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Assets - Accounts Receivable (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Accounts Receivable    
Allowance for doubtful accounts receivable $ 0.6 $ 0.6
Impact of COVID-19    
Accounts Receivable    
Change in allowance for doubtful accounts $ 0.0