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Other Noncurrent Liabilities - Components of Other Noncurrent Liabilities (Detail) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Other Liabilities Noncurrent [Abstract]    
Accrued postretirement benefits $ 7.7 $ 7.4
Employee benefits 6.9 7.3
Other 11.2 14.1
Total $ 25.8 $ 28.8