| In millions, except per share items | Jun-30-16 | Jun-30-15 | Jun-30-14 | Jun-30-13 | Jun-30-12 | Jun-30-11 | Jun-30-10 | Jun-30-09 |
| | 10-K | 10-K | 10-K | 10-K | 10-K/A | 10-K | 10-K | 10-K |
| Cash Flows From Operating Activities | | | | | | | | |
| Net loss | -1,918.8 | -2,433.8 | 18.1 | 180.8 | 335.8 | 64.7 | 27.3 | |
| |
| Adjustments to reconcile net loss to net cash from (used in) operating activities: | | | | | | | | |
| Depreciation, depletion and amortization | 339.5 | 705.5 | 414.0 | 363.8 | 367.5 | 293.5 | 181.6 | |
| Impairment of oil and natural gas properties | 2,813.6 | 2,421.9 | | | | | | |
| Gain on early extinguishment of debt | -1,525.6 | | | | | | | |
| Change in fair value of derivative financial instruments | 19.2 | -52.0 | 69.7 | 20.9 | | | | |
| Payment of interest in-kind | | | | | | | | |
| Accretion of asset retirement obligations | 64.7 | 50.1 | 30.2 | 30.9 | 39.2 | 32.1 | 23.5 | |
| Loss from equity method investees | 10.7 | 17.2 | 5.2 | 6.0 | | | | |
| Amortization and write-off of debt issuance costs and other | 138.5 | 23.2 | 13.8 | 6.9 | 7.6 | 15.8 | 7.8 | |
| Deferred rent | 9.2 | | | | | | | |
| Stock-based compensation | 1.3 | 4.1 | 6.7 | 3.5 | 11.8 | 4.4 | 3.5 | |
| Changes in operating assets and liabilities | | | | | | | | |
| Accounts receivable | 42.7 | 51.3 | 63.3 | 1.7 | -5.0 | -49.7 | -18.4 | |
| Prepaid expenses and other current assets | -24.4 | 48.1 | 6.0 | 12.5 | -15.9 | -13.3 | -16.4 | |
| Settlement of asset retirement obligations | -78.3 | -106.6 | -57.4 | -41.9 | -15.0 | -74.0 | -80.0 | |
| Accounts payable and accrued liabilities | -62.2 | -113.1 | -55.5 | 33.5 | 6.5 | 137.8 | 39.1 | |
| Net Cash Provided by (Used in) Operating Activities | -166.7 | 330.8 | 545.5 | 638.1 | 785.5 | 387.7 | 121.2 | |
| |
| Cash Flows from Investing Activities | | | | | | | | |
| Acquisitions, net of cash | -2.8 | -0.3 | -849.6 | -161.2 | -6.4 | -1,012.3 | -293.0 | |
| Capital expenditures | -111.9 | -723.8 | -788.7 | -816.1 | -570.7 | -281.2 | -145.1 | |
| Insurance payments received | 8.3 | 3.9 | 2.0 | | 6.5 | | 54.0 | |
| Transfer to restricted cash | -22.1 | -14.7 | -0.3 | | | | | |
| Proceeds from the sale of properties | 5.7 | 261.9 | 126.3 | | 2.8 | 38.4 | | |
| Other | 0.0 | -0.1 | 0.1 | 0.0 | 0.5 | 0.0 | 0.0 | |
| Net Cash Used in Investing Activities | -122.9 | -460.4 | -1,544.6 | -994.0 | -569.6 | -1,255.1 | -384.2 | |
| |
| Cash Flows from Financing Activities | | | | | | | | |
| Proceeds from the issuance of common and preferred stock, net of offering costs | 0.3 | 2.3 | 4.0 | 7.0 | 9.8 | 562.1 | 294.5 | |
| Dividends to shareholders - preferred | -5.7 | -11.5 | -11.5 | -11.5 | -18.7 | -12.3 | | |
| Payments on long-term debt | -227.9 | -1,747.8 | -2,079.5 | -1,243.8 | -1,008.3 | -1,456.2 | -294.0 | |
| Payment of debt assumed in acquisition | -253.1 | -1,747.8 | -2,079.5 | -1,243.8 | -1,008.3 | -1,456.2 | -294.0 | |
| |
| Fees related to debt extinguishment | | | | | | | | |
| Debt issuance costs | -2.2 | -43.4 | -33.5 | -4.8 | | -29.6 | -13.0 | |
| Other | -1.0 | -0.1 | | 0.0 | -0.8 | -0.3 | -1.1 | |
| Net Cash Used in Financing Activities | -264.0 | 740.7 | 1,144.9 | 238.8 | -127.2 | 881.5 | 188.2 | |
| |
| Net Increase (Decrease) in Cash and Cash Equivalents | -553.6 | 611.0 | 145.8 | -117.1 | 88.7 | 14.2 | -74.7 | |
| Cash and Cash Equivalents, beginning of period | 756.8 | 145.8 | | 117.1 | 28.4 | 14.2 | 88.9 | |
| Cash and Cash Equivalents, end of period | 203.3 | 756.8 | 145.8 | | 117.1 | 28.4 | 14.2 | |