Business combinations Business combinations (Narrative) (Details) - Midstream - Crude Oil Logistics [Member] $ in Millions |
6 Months Ended |
|---|---|
|
Jan. 31, 2016
USD ($)
| |
| Payments to Acquire Businesses, Gross | $ 560.0 |
| Business Combination, Consideration Transferred, Equity Interests Issued and Issuable | 260.0 |
| Business Acquisition Cost Of Acquired Entity Issuance Of Liabilities And Other Costs | 2.5 |
| Business Combination, Consideration Transferred | 822.5 |
| Ferrellgas, L.P. [Member] | |
| Payments to Acquire Businesses, Gross | 560.0 |
| Business Combination, Consideration Transferred, Equity Interests Issued and Issuable | 260.0 |
| Business Acquisition Cost Of Acquired Entity Issuance Of Liabilities And Other Costs | 2.5 |
| Business Combination, Consideration Transferred | $ 822.5 |