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Other Noncurrent Liabilities - Components of Other Noncurrent Liabilities (Detail) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Other Liabilities Noncurrent [Abstract]    
Accrued postretirement benefits $ 7.5 $ 7.4
Employee benefits 7.0 7.3
Other 14.0 14.1
Total $ 28.5 $ 28.8