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Commitments and Contingencies (Details) $ in Millions |  | 1 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jul. 11, 2017 item | Dec. 31, 2014 USD ($) | Jun. 30, 2017 USD ($) item | Sep. 30, 2016 USD ($)
Standby letter of credit |  |  |  |
Commitments and Contingencies |  |  |  |
Contingency liability |  |  | $ 495.8 | $ 474.5
Surety Bond |  |  |  |
Commitments and Contingencies |  |  |  |
Surety bonds issued |  |  | 4,500.0 | $ 3,300.0
DOE Deactivation, Demolition, And Removal Project | Department of Energy | Maximum |  |  |  |
Commitments and Contingencies |  |  |  |
Cost-reimbursement at risk |  |  | 106.0 |
DOE Deactivation, Demolition, And Removal Project | WGI Ohio and DOE | Minimum |  |  |  |
Commitments and Contingencies |  |  |  |
Cost-reimbursement at risk |  |  | 106.0 |
DOE Deactivation, Demolition, And Removal Project | WGI Ohio and DOE | Maximum |  |  |  |
Commitments and Contingencies |  |  |  |
Cost-reimbursement at risk |  |  | 146.0 |
DOE Deactivation, Demolition, And Removal Project | WGI Ohio |  |  |  |
Commitments and Contingencies |  |  |  |
Claim to DOE, including additional fees |  | $ 103.0 |  |
Possible costs which may exceed contracted amounts |  | $ 100.0 |  |
DOE Deactivation, Demolition, And Removal Project | WGI Ohio | Minimum |  |  |  |
Commitments and Contingencies |  |  |  |
Cost-reimbursement at risk |  |  | $ 146.0 |
World Bank Review - Asia-Pacific |  |  |  |
Commitments and Contingencies |  |  |  |
Number of entities inspected for compliance | item |  |  | 2 |
World Bank Review - Asia-Pacific | Subsequent Event |  |  |  |
Commitments and Contingencies |  |  |  |
Term of debarring bidding on projects funded by World Bank, entity one | 18 months |  |  |
Term of debarring bidding on projects funded by World Bank, entity two | 6 months |  |  |
Number of entities required to adopt compliance program | item | 1 |  |  |

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