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Long-Term Debt - Schedule of Long-Term Debt (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Deferred finance costs $ (0.0) $ (1.4)
Long-term debt 0.0 58.6
Less current portion (0.0) (0.0)
Long-term debt, net of current portion 0.0 58.6
Term Loan [Member]    
Debt Instrument [Line Items]    
Long-term debt 0.0 0.0
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 0.0 $ 60.0