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Long-Term Debt - Schedule of Long-Term Debt (Detail) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Deferred finance costs $ (1.4) $ (1.6)
Long-term debt 213.6 218.4
Due within one year (15.8) (15.8)
Due after one year 197.8 202.6
Term Loan [Member]    
Debt Instrument [Line Items]    
Long-term debt 99.0 99.0
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 116.0 $ 121.0