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Commitments and Contingencies - Narrative (Details) |  |  |  | 48 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 20, 2018 subclass | Mar. 20, 2018 collective_bargaining_arrangement | Jan. 26, 2018 plaintiff | Oct. 24, 2018 | Oct. 31, 2019 USD ($) | Oct. 31, 2018 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |
Letters of credit |  |  |  |  | $ 149,800,000 |
Surety bonds |  |  |  |  | $ 596,800,000 |
Subsidiary ownership interest percentage |  |  |  |  | 33.00% |
Number of collective bargaining arrangements | collective_bargaining_arrangement |  | 3 |  |  |  |
Minimum |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Subsidiary ownership interest percentage |  |  |  |  | 20.00% |
Estimate of reasonably possible loss |  |  |  |  | $ 0 |
Maximum |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Subsidiary ownership interest percentage |  |  |  |  | 50.00% |
Estimate of reasonably possible loss |  |  |  |  | $ 6,000,000 |
Castro |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of plaintiffs | plaintiff |  |  | 3 |  |  |
Occurrence period after compliant |  |  |  | 4 years |  |
Bucio |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of certified subclasses | subclass | 4 |  |  |  |  |
Energy Savings Contracts |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Guarantee obligation |  |  |  |  | 174,800,000 | $ 171,700,000
Performance Guarantee | Joint Venture |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Total guarantee |  |  |  |  | 41,000,000 |
Pending Litigation |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Loss contingency amount accrued for probable losses |  |  |  |  | 6,500,000 |
Pending Litigation | Castro |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Loss contingency amount accrued for probable losses |  |  |  |  | $ 5,400,000 |

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