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Debt - Summary of Long-term Debt (Detail) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Debt Disclosure [Abstract]      
Revolving credit facility $ 62.9 $ 46.1 $ 75.5
Other obligations 2.4 2.5 2.5
Total debt 65.3 48.6 78.0
Less current portion 1.0 1.2 1.1
Long-term debt $ 64.3 $ 47.4 $ 76.9