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Litigation and Contingencies - Additional Information (Detail)
$ in Millions
 1 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Recipient
entity
Sep. 30, 2021
USD ($)
entity
alternative
Recipient
mi
Jun. 30, 2018
party
Feb. 28, 2015
USD ($)
Apr. 11, 2014
USD ($)
Loss Contingencies [Line Items]          
Environmental remediation expense   $ 38.0      
Number of general notice letter recipients | entity   100      
Miles of river included in the remedial investigation and feasibility study | mi   8.3      
Number of remediation alternatives | alternative   4      
Number Of PRPs (in recipients) | Recipient 20        
Number of public entities (in entities) | entity 5        
Standby letters of credit outstanding   $ 48.0      
Minimum          
Loss Contingencies [Line Items]          
Loss contingency, estimate of possible loss         $ 1.0
Maximum          
Loss Contingencies [Line Items]          
Loss contingency, estimate of possible loss         2.0
Lower Passaic River Matter          
Loss Contingencies [Line Items]          
Number of general notice letter recipients involved in remedial investigation and feasibility study | Recipient   72      
Loss contingency estimated period   30 years      
Loss contingency, damages sought   $ 441.0      
Number of parties sued (in parties) | party     120    
Lower Passaic River Matter | Minimum          
Loss Contingencies [Line Items]          
Loss contingency, estimate of possible loss         315.0
Lower Passaic River Matter | Maximum          
Loss Contingencies [Line Items]          
Loss contingency, estimate of possible loss         3,200.0
Lower Passaic River Matter - Preferred Alternative          
Loss Contingencies [Line Items]          
Loss contingency, estimate of possible loss         1,700.0
Lower Passaic River Matter - Preferred Alternative Maintenance Costs          
Loss Contingencies [Line Items]          
Loss contingency, estimate of possible loss         $ 2.0
Lower Passaic River Matter - Alternative Range from Participating Parties          
Loss Contingencies [Line Items]          
Miles of river included in the remedial investigation and feasibility study | mi   9      
Lower Passaic River Matter - Alternative Range from Participating Parties | Minimum          
Loss Contingencies [Line Items]          
Loss contingency, estimate of possible loss       $ 28.0  
Lower Passaic River Matter - Alternative Range from Participating Parties | Maximum          
Loss Contingencies [Line Items]          
Loss contingency, estimate of possible loss       $ 2,700.0  
Lower Passaic River Matter - Selected Remedy for the Preferred Alternative          
Loss Contingencies [Line Items]          
Settlement amount $ 0.3 $ 1,400.0      
Lower half of river          
Loss Contingencies [Line Items]          
Miles of river included in the remedial investigation and feasibility study | mi   17