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Commitments and Contingencies (Details) - USD ($) $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Oct. 18, 2022 | Dec. 13, 2019 | Mar. 31, 2016 | Dec. 31, 2019 | Sep. 30, 2025 | Apr. 13, 2023
Alaskan Way Viaduct Matter |  |  |  |  |  |
Contingencies and Commitments |  |  |  |  |  |
Value of claim filed |  |  | $ 57.2 |  |  |
Settlement on judgment, awarded to other party |  | $ 57.2 |  |  |  |
Pre-tax charge, impact from jury verdict |  |  |  | $ 166.8 |  |
Pre-tax accrual, impact from jury verdict |  |  |  | 25.7 |  |
Settlement on judgment |  |  |  | $ 57.2 |  |
Loss contingency, damages paid, value | $ 34.6 |  |  |  |  |
Alaskan Way Viaduct Matter | Seattle Tunnel Partners |  |  |  |  |  |
Contingencies and Commitments |  |  |  |  |  |
Ownership joint venture (as a percent) |  |  |  | 45.00% | 45.00% |
Seattle Tunnel Partners |  |  |  |  |  |
Contingencies and Commitments |  |  |  |  |  |
Value of counterclaim filed in excess of |  |  | $ 640.0 |  |  |
HNTB |  |  |  |  |  |
Contingencies and Commitments |  |  |  |  |  |
Value of counterclaim filed in excess of |  |  |  |  |  | $ 300.0

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