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Derivative Activities - Additional Information (Detail) $ in Millions | Sep. 30, 2019 USD ($) t_per_M MMBTU bbl
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Derivatives Excluding Basis Swaps and Freight Swaps |
Derivative [Line Items] |
Derivative assets liabilities at fair value net | $ 152.3
Commodity | Natural Gas Basis Swaps |
Derivative [Line Items] |
Derivative assets liabilities at fair value net | $ 4.6
Volume Hedged | MMBTU | 129,765,000
Commodity | Propane Spread Swaps |
Derivative [Line Items] |
Derivative assets liabilities at fair value net | $ (3.3)
Volume Hedged | bbl | 1,875,000
Freight | Swaps | Level 2 |
Derivative [Line Items] |
Derivative assets liabilities at fair value net | $ 1.4
Freight | Swaps | Contracts Settle Through December 2019 | Level 2 |
Derivative [Line Items] |
Volume Hedged | t_per_M | 10,000
Freight | Swaps | Contracts Settle in 2020 | Level 2 |
Derivative [Line Items] |
Volume Hedged | t_per_M | 4,000
Freight | Swaps | Contracts Settle in 2021 | Level 2 |
Derivative [Line Items] |
Volume Hedged | t_per_M | 5,000

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