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Long-Term Borrowings (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Mar. 13, 2013
Debt Instrument [Line Items]      
Total long-term borrowings and capital lease obligations $ 64.0 $ 44.1  
Less: Current capital lease obligations 0.5 0.4  
Total long-term borrowings and capital lease obligations, net 63.5 43.7  
Revolving Credit Facility      
Debt Instrument [Line Items]      
Total long-term borrowings and capital lease obligations 63.2 0.0  
Less: Current maturities     $ 6.9
Term Loan      
Debt Instrument [Line Items]      
Total long-term borrowings and capital lease obligations 0.0 43.4  
Capital Lease Obligations      
Debt Instrument [Line Items]      
Total long-term borrowings and capital lease obligations $ 0.8 $ 0.7