| Revenue and other operating income | — | — | — |
| Natural gas, NGLs and oil revenue | 1,302.22a | 3,652.11a | 2,183.93a |
| Gain (loss) on commodity derivative instruments | 1,928.65a | -2,663.78a | -1,632.73a |
| Purchased gas revenue | 74.22a | 185.55a | 99.71a |
| Other revenue and operating income | 129.86a | 87.32a | 105.88a |
| Total revenue and other operating income | 3,434.95a | 1,261.21a | 756.79a |
| Costs and expenses: operating expense | — | — | — |
| Lease operating expense | -63.33a | -66.66a | -46.26a |
| Transportation, gathering and compression | -381.93a | -369.66a | -343.64a |
| Production, ad valorem and other fees | -27.95a | -44.97a | -34.05a |
| Depreciation, depletion and amortization | -433.59a | -461.22a | -515.12a |
| Exploration and production related other costs | -10.45a | -8.3a | -20.63a |
| Purchased gas costs | -69.92a | -185.38a | -93.78a |
| Selling, general and administrative costs | -125.34a | -121.7a | -112.76a |
| Other operating expense | -79.6a | -63.77a | -68.66a |
| Total operating expense | -1,192.11a | -1,321.64a | -1,234.87a |
| Other expense | — | — | — |
| Other expense | -9.01a | -9.86a | -15.75a |
| Gain on asset sales and abandonments, net | -132.37a | -8.98a | -42.21a |
| Loss on debt extinguishment | 0a | -22.95a | -33.74a |
| Interest expense | -143.28a | -127.69a | -151.16a |
| Total other expense | -19.91a | -151.52a | -158.43a |
| Total costs and expenses | -1,212.02a | -1,473.16a | -1,393.31a |
| Income (loss) before income tax | 2,222.93a | -211.95a | -636.51a |
| Income tax expense (benefit) | -502.21a | -69.87a | -137.87a |
| Net income (loss) | 1,720.72a | -142.08a | -498.64a |