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Commitments and Contingencies - Changes in Accrued Environmental Remediation and Related Costs (Detail) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Environmental Remediation Obligations [Abstract]      
Balance at the beginning of the year $ 99.7    
Additions charged to expense 0.4    
Payments, net (1.0)    
Other, net (0.1)    
Balance at the end of the period 99.0    
Amounts recognized in our Condensed Consolidated Balance Sheet at the end of the period:      
Current liabilities   $ 4.5 $ 4.5
Noncurrent liabilities   94.5 95.2
Total $ 99.0 $ 99.0 $ 99.7