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Other Noncurrent Liabilities - Components of Other Noncurrent Liabilities (Detail) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Other Liabilities Noncurrent [Abstract]    
Employee benefits $ 8.9 $ 8.5
Other 13.7 13.0
Total $ 22.6 $ 21.5