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Commitments and Contingencies (Details) - USD ($) $ in Millions |  |  | 1 Months Ended | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2020 | Dec. 06, 2019 | Dec. 31, 2019 | Apr. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2024 | Sep. 30, 2024 | Dec. 31, 2014 | Feb. 28, 2011
Fund Investment Capital |  |  |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Capital commitments |  |  |  |  |  | $ 5.1 |  |  |
Commitment period (in years) |  |  |  |  |  | 4 years |  |  |
Standby Letters of Credit |  |  |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Outstanding standby letters of credit |  |  |  |  |  | $ 930.2 | $ 934.5 |  |
Amount available under unsecured credit facilities |  |  |  |  |  | 390.9 |  |  |
Contingently liable for issuance of standby letters of credit and surety bonds |  |  |  |  |  | 934.6 |  |  |
Surety Bond |  |  |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Contingently liable for issuance of standby letters of credit and surety bonds |  |  |  |  |  | 5,200.0 |  |  |
Task Order, Deactivation Demolition And Removal Service |  |  |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Percentage of claim recoveries due to purchaser | 10.00% |  |  |  |  |  |  |  |
Percentage of claim recoveries due to seller | 90.00% |  |  |  |  |  |  |  |
Task Order, Deactivation Demolition And Removal Service | Department of Energy |  |  |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Maximum project cost to pay |  |  |  |  |  |  |  |  | $ 106.0
Additional fees on changed work scope |  | $ 60.4 |  |  |  |  |  | $ 103.0 |
Task Order, Deactivation Demolition And Removal Service | Department of Energy | Minimum | Former Affiliate |  |  |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Damages sought |  | 148.5 |  |  |  |  |  |  |
Task Order, Deactivation Demolition And Removal Service | Department of Energy | Maximum | Former Affiliate |  |  |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Damages sought |  | $ 329.4 |  |  |  |  |  |  |
Task Order, Deactivation Demolition And Removal Service | Former Affiliate and DOE |  |  |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Maximum project cost to pay |  |  |  |  |  | 146.0 |  |  |
Minimum project cost to pay |  |  |  |  |  | 106.0 |  |  |
Task Order, Deactivation Demolition And Removal Service | Former Affiliate |  |  |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Minimum project cost to pay |  |  |  |  |  | 146.0 |  |  |
Refinery Turnaround Project |  |  |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Additional fees on changed work scope |  |  |  |  |  | 90.0 |  |  |
Entitled to Payment from the refinery owner |  |  |  |  |  | $ 144.0 |  |  |
Construction lien against the refinery for unpaid labor and materials costs |  |  |  | $ 132.0 |  |  |  |  |
Refinery Turnaround Project | A Refinery in Montana |  |  |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Damages sought, counter party |  |  | $ 93.0 |  | $ 79.0 |  |  |  |

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