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Subsequent Event	9 Months Ended
Subsequent Event	Sep. 30, 2017
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event On October 2, 2017, we sold our 50% interest in Oklahoma CO2 Partnership (OKCO2), a joint venture that owns a carbon dioxide liquefaction and purification facility at our nitrogen complex, to the joint venture partner for $15.1 million plus certain customary closing and working capital adjustments that are expected to be determined in the fourth quarter of 2017. The proceeds from the sale of our interest in OKCO2 will be included in the determination of Available Cash in the quarter in which the customary closing and working capital adjustments are finalized.