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Other Noncurrent Liabilities - Components of Other Noncurrent Liabilities (Detail) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Other Liabilities Noncurrent [Abstract]    
Accrued postretirement benefits $ 7.9 $ 8.0
Employee benefits 6.0 6.0
Other 14.8 14.2
Total $ 28.7 $ 28.2