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Commitments and Contingencies - Narrative (Details) | Dec. 08, 2017 USD ($) | Nov. 03, 2017 USD ($) plaintiff | Feb. 07, 2017 plaintiff | Jan. 31, 2018 USD ($)
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Loss Contingencies [Line Items] |  |  |  |
Standby letters of credit |  |  |  | $ 145,500,000
Surety bonds |  |  |  | $ 470,000,000
Subsidiary ownership interest percentage |  |  |  | 33.00%
Loss contingency amount accrued for probable losses |  |  |  | $ 10,000,000
Energy Savings Contracts |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Guarantee obligation |  |  |  | 164,600,000
Performance Guarantee | Joint Venture |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Total guarantees |  |  |  | 35,000,000
Hussein And Isse |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss contingency amount accrued for probable losses |  |  |  | 3,800,000
Settlement amount |  | $ 8,300,000 |  |
Isse |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of plaintiffs | plaintiff |  | 220 | 60 |
Payments for legal settlements | $ 4,500,000 |  |  |
Minimum |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Amount of reasonably possible loss |  |  |  | 0
Maximum |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Amount of reasonably possible loss |  |  |  | $ 8,000,000

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