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Litigation and Contingencies - Additional Information (Detail) $ in Millions | 1 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2016 USD ($) Recipient entity | Jun. 30, 2021 USD ($) Recipient alternative entity mi | Aug. 07, 2020 USD ($) | Sep. 30, 2018 party | Feb. 28, 2015 USD ($) | Apr. 11, 2014 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |
Environmental remediation expense |  | $ 40.0 |  |  |  |
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 |  | $ 52.0 |  |  |  |
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 |  |  |  |
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 |  |  | $ 321.0 |  | $ 28.0 |
Lower Passaic River Matter - Alternative Range from Participating Parties | Maximum |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Loss contingency, estimate of possible loss |  |  | $ 468.0 |  | $ 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 |  |  |  |

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