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Commitments and Contingencies - Additional Information (Details) |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |  |  |  |
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Apr. 14, 2021 USD ($) mi | Jun. 30, 2018 party | Mar. 03, 2016 USD ($) | Apr. 11, 2014 USD ($) mi | Aug. 31, 2025 USD ($) mine | Sep. 30, 2022 USD ($) | Aug. 27, 2025 employee | Sep. 30, 2025 USD ($) site mine party mi | May 28, 2025 claim | Dec. 31, 2024 USD ($) | Jun. 04, 2024 claim | Nov. 30, 2022 facility site | Oct. 18, 2021 | Oct. 31, 2016 USD ($) | Apr. 30, 2015 USD ($)
Site Contingency |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of sites subject to remediation (sites) | site |  |  |  |  |  |  |  | 21 |  |  |  |  |  |  |
Number of sites, active operations (sites) | site |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |
Number of sites expected to cost less than 500K (sites) | site |  |  |  |  |  |  |  | 11 |  |  |  |  |  |  |
Expected future cost of remediation or investigation (less than) |  |  |  |  |  |  |  | $ 500,000 |  |  |  |  |  |  |
Number of sites subsidiaries formally conducted business but no longer do | site |  |  |  |  |  |  |  | 20 |  |  |  |  |  |  |
Environmental loss accrual |  |  |  |  |  |  |  | $ 37,400,000 |  | $ 40,700,000 |  |  |  |  |
Environmental |  |  |  |  |  |  |  | $ 8,900,000 |  |  |  |  |  |  |
Environmental loss contingency statement of financial position extensible enumeration not disclosed flag |  |  |  |  |  |  |  | Consolidated Balance Sheets |  |  |  |  |  |  |
Loss accrual |  |  |  |  |  |  |  | $ 15,900,000 |  |  |  |  |  |  |
Lower Passaic River Study Area |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |
Lower Passaic River Study Area | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Site Contingency |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Site contingency, loss exposure in excess of accrual best estimate |  |  | $ 1,380,000,000 | $ 953,000,000 |  |  |  |  |  |  |  |  |  |  |
Lower Passaic River Study Area | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Site Contingency |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Site contingency, loss exposure in excess of accrual best estimate |  |  | $ 1,730,000,000 |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of sites subject to remediation (sites) | site |  |  |  |  |  |  |  | 21 |  |  |  |  |  |  |
Number of sites, active operations (sites) | site |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |
Environmental loss accrual |  |  |  |  |  |  |  | $ 11,200,000 |  |  |  |  |  |  |
Estimate low end |  |  |  |  | $ 3,600,000 |  |  | $ 7,600,000 |  |  |  |  |  |  |
Investigative sites notice from EPA | mine |  |  |  |  |  |  |  | 8 |  |  |  |  |  |  |
Number of priority mines | mine |  |  |  |  | 2 |  |  | 2 |  |  |  |  |  |  |
Number of non priority mines | mine |  |  |  |  |  |  |  | 6 |  |  |  |  |  |  |
Site contingency, number of sites subject to enhanced cap remediation count | mine |  |  |  |  |  |  |  | 8 |  |  |  |  |  |  |
Percentage of expenses reimbursable by the U.S. |  |  |  |  |  |  |  |  |  |  |  |  | 35.00% |  |
Future contributions from U.S. |  |  |  |  |  |  |  | $ 3,600,000 |  |  |  |  |  |  |
Arizona Uranium Mines | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Site Contingency |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Site contingency, loss exposure in excess of accrual best estimate |  |  |  |  | $ 3,600,000 |  |  |  |  |  |  |  |  |  |
Arizona Uranium Mines | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Site Contingency |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Site contingency, loss exposure in excess of accrual best estimate |  |  |  |  | $ 15,900,000 |  |  |  |  |  |  |  |  |  |
Thorofare, New Jersey |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Site Contingency |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of sites, active operations (sites) | site |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |
Number of facilities (facilities) | facility |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |
GGB (ISRA) Investigation and Cleanup |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Site Contingency |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental loss accrual |  |  |  |  |  |  |  | 2,000,000 |  |  |  |  |  |  |
Water Valley, Mississippi |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Site Contingency |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental loss accrual |  |  |  |  |  |  |  | 7,700,000 |  |  |  |  |  |  |
Number of pending claims | claim |  |  |  |  |  |  |  |  | 8 |  | 8 |  |  |  |
Number of total plantiffs | employee |  |  |  |  |  |  | 150 |  |  |  |  |  |  |  |
Litigation reserve |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |
Number of sites subject to remediation, addition (sites) | site |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |
Number of sites subject to remediation, remaining (sites) | site |  |  |  |  |  |  |  | 17 |  |  |  |  |  |  |
Related Party | Lower Passaic River Study Area |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Site Contingency |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Portion of site subject to remediation (miles) | mi |  |  |  |  |  |  |  | 17 |  |  |  |  |  |  |
Related Party | Crucible Steel Corporation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Site Contingency |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Portion of site subject to remediation (miles) | mi |  |  |  |  |  |  |  | 17 |  |  |  |  |  |  |

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