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Long-Term Debt - Components of Long-Term Debt (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Debt Disclosure [Abstract]    
Term loan $ 335.9 $ 338.0
Other 3.1 3.0
Total debt 339.0 341.0
Less current maturities 3.6 3.8
Total long-term debt $ 335.4 $ 337.2