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Commitments and Contingencies - Narrative (Details) | Sep. 20, 2018 subclass | Apr. 30, 2020 USD ($)
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Loss Contingencies [Line Items] |  |
Standby letters of credit |  | $ 153,100,000
Subsidiary ownership interest (in percent) |  | 33.00%
Surety Bonds |  |
Loss Contingencies [Line Items] |  |
Surety bonds |  | $ 575,900,000
Energy Savings Contracts |  |
Loss Contingencies [Line Items] |  |
Guarantee obligation |  | 183,600,000
Performance Guarantee | Joint Venture |  |
Loss Contingencies [Line Items] |  |
Total guarantees |  | 41,000,000
Minimum |  |
Loss Contingencies [Line Items] |  |
Amount of reasonably possible loss |  | 0
Maximum |  |
Loss Contingencies [Line Items] |  |
Amount of reasonably possible loss |  | 12,000,000
Bucio |  |
Loss Contingencies [Line Items] |  |
Loss Contingency, Number Of Certified Subclasses | subclass | 4 |
Pending Litigation |  |
Loss Contingencies [Line Items] |  |
Loss contingency amount accrued for probable losses |  | $ 6,800,000

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