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Commitments and Contingencies - Additional Information (Details) |  |  |  |  | 1 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 14, 2021 USD ($) mi | Jun. 30, 2018 party | Mar. 03, 2016 USD ($) | Apr. 11, 2014 USD ($) mi | Sep. 30, 2022 USD ($) | Oct. 31, 2016 USD ($) | Sep. 30, 2023 USD ($) site party mine mi | Dec. 31, 2022 USD ($) | Oct. 18, 2021 | Apr. 30, 2015 USD ($)
Site Contingency |  |  |  |  |  |  |  |  |  |
Number of sites subject to remediation (sites) | site |  |  |  |  |  |  | 18 |  |  |
Number of sites, cost in excess of 100K (sites) | site |  |  |  |  |  |  | 12 |  |  |
Cost per site minimis threshold |  |  |  |  |  |  | $ 100,000 |  |  |
Number of sites, investigation completed (sites) | site |  |  |  |  |  |  | 15 |  |  |
Number of sites investigation in progress (sites) | site |  |  |  |  |  |  | 3 |  |  |
Site contingency, number of sites subject to remediation activities, contains remediation systems | site |  |  |  |  |  |  | 7 |  |  |
Site contingency, number of sites subject to remediation activities, monitored | site |  |  |  |  |  |  | 8 |  |  |
Number of sites, active operations (sites) | site |  |  |  |  |  |  | 1 |  |  |
Environmental loss accrual |  |  |  |  |  |  | $ 39,200,000 | $ 42,100,000 |  |
Environmental |  |  |  |  |  |  | 12,000,000.0 | $ 10,400,000 |  |
Loss accrual |  |  |  |  |  |  | $ 26,700,000 |  |  |
Lower Passaic River |  |  |  |  |  |  |  |  |  |
Site Contingency |  |  |  |  |  |  |  |  |  |
Portion of site subject to remediation (miles) | mi |  |  |  | 8 |  |  |  |  |  |
Number of other potentially responsible parties | party |  | 120 |  |  |  |  | 70 |  |  |
Estimate of cost |  |  |  |  |  |  |  |  |  | $ 726,000,000
Estimate low end |  |  |  |  |  | $ 165,000,000 |  |  |  |
Estimated development time (in years) |  |  |  |  |  | 4 years |  |  |  |
Upper Nine Miles of the River |  |  |  |  |  |  |  |  |  |
Site Contingency |  |  |  |  |  |  |  |  |  |
Portion of site subject to remediation (miles) | mi | 9 |  |  |  |  |  |  |  |  |
Site contingency, loss exposure in excess of accrual best estimate | $ 441,000,000 |  |  |  |  |  |  |  |  |
Lower Eight Miles of River |  |  |  |  |  |  |  |  |  |
Site Contingency |  |  |  |  |  |  |  |  |  |
Environmental loss accrual |  |  |  |  |  |  | $ 700,000 |  |  |
Settlement payment |  |  |  |  | $ 5,900,000 |  |  |  |  |
Arizona Uranium Mines |  |  |  |  |  |  |  |  |  |
Site Contingency |  |  |  |  |  |  |  |  |  |
Environmental loss accrual |  |  |  |  |  |  | $ 11,900,000 |  |  |
Investigative sites notice from EPA | mine |  |  |  |  |  |  | 8 |  |  |
Percentage of expenses reimbursable by the U.S. (as a percent) |  |  |  |  |  |  |  |  | 35.00% |
Future contributions from U.S. |  |  |  |  |  |  | $ 3,000,000 |  |  |
Water Valley, Mississippi |  |  |  |  |  |  |  |  |  |
Site Contingency |  |  |  |  |  |  |  |  |  |
Loss accrual |  |  |  |  |  |  | $ 13,700,000 |  |  |
Minimum | Lower Passaic River |  |  |  |  |  |  |  |  |  |
Site Contingency |  |  |  |  |  |  |  |  |  |
Site contingency, loss exposure in excess of accrual best estimate |  |  | $ 1,380,000,000 | $ 953,000,000 |  |  |  |  |  |
Maximum | Lower Passaic River |  |  |  |  |  |  |  |  |  |
Site Contingency |  |  |  |  |  |  |  |  |  |
Site contingency, loss exposure in excess of accrual best estimate |  |  | $ 1,730,000,000 |  |  |  |  |  |  |
Related Party | Crucible Steel Corporation |  |  |  |  |  |  |  |  |  |
Site Contingency |  |  |  |  |  |  |  |  |  |
Number of sites subject to remediation (sites) | site |  |  |  |  |  |  | 18 |  |  |
Portion of site subject to remediation (miles) | mi |  |  |  |  |  |  | 17 |  |  |

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