| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 |
| | 10-K | 10-K | 10-K/A | 10-K | 10-K | 10-K | 10-K | 10-K |
| ASSETS | | | | | | | | |
| Current assets: | | | | | | | | |
| Cash and cash equivalents | 8.0 | 4.3 | 4.2 | 5.5 | 4.5 | 4.7 | 0.1 | |
| |
| Accounts receivable | | | | | | | | |
| Inventory | 1.5 | 2.4 | 3.1 | 12.6 | 5.5 | 20.9 | 8.9 | 10.5 |
| Other current assets | 2.5 | 1.0 | 0.3 | 2.2 | 1.0 | 0.8 | 1.1 | 1.5 |
| Total current assets | 65.2 | 23.0 | 29.3 | 33.6 | 32.6 | 50.5 | 32.0 | 47.0 |
| |
| Property, plant and equipment: | | | | | | | | |
| Property, plant and equipment | 1,240.7 | 715.9 | 692.3 | 461.3 | 452.7 | 367.2 | 342.4 | 325.6 |
| Less: accumulated depreciation | -316.7 | -266.5 | -227.5 | -166.3 | -140.2 | -112.1 | -91.4 | -71.8 |
| Property, plant and equipment, net | 924.0 | 449.4 | 464.8 | 295.0 | 312.6 | 255.1 | 251.0 | 253.8 |
| Equity method investments | 257.0 | 250.0 | 253.7 | 247.0 | 104.8 | 106.5 | 101.1 | 40.7 |
| Intangibles, net | | 116.6 | 123.8 | 131.0 | 138.2 | | | |
| Rights-of-way, net | 56.0 | 37.3 | | | | | | |
| Goodwill | 27.1 | 12.2 | 12.2 | 12.2 | 12.2 | 12.2 | 12.2 | 12.2 |
| Operating lease right-of-use assets | 24.8 | 20.9 | 24.2 | 3.7 | | | | |
| Other non-current assets | 16.4 | 25.6 | 12.1 | 6.3 | 24.3 | 3.4 | 4.8 | 6.0 |
| Total assets | 1,679.3 | 935.1 | 956.4 | 744.4 | 624.6 | 443.5 | 415.5 | 375.3 |
| |
| LIABILITIES AND DEFICIT | | | | | | | | |
| Current liabilities: | | | | | | | | |
| Accounts payable | | | | | | | | |
| Current portion of long-term debt | 15.0 | | | | | | | |
| Interest payable | 5.3 | 5.0 | 2.5 | 2.6 | 2.7 | | | |
| Excise and other taxes payable | 8.2 | 5.3 | 5.0 | 3.9 | 4.1 | 4.7 | 4.8 | 4.9 |
| Current portion of operating lease liabilities | 8.0 | 6.8 | 8.7 | 1.4 | | | | |
| Accrued expenses and other current liabilities | 6.2 | 7.1 | 5.5 | 5.8 | 10.4 | 6.0 | 2.9 | 1.7 |
| Total current liabilities | 106.2 | 96.8 | 28.3 | 35.1 | 36.5 | 31.8 | 20.7 | 20.7 |
| |
| Non-current liabilities: | | | | | | | | |
| Long-term debt, net of current portion | 1,646.6 | 899.0 | 992.3 | 833.1 | 700.4 | 422.6 | 392.6 | 351.6 |
| Operating lease liabilities, net of current portion | 12.1 | 14.1 | 15.4 | 2.3 | | | | |
| Asset retirement obligations | 9.3 | 6.5 | 6.0 | 5.6 | 5.2 | 4.1 | 3.8 | 3.5 |
| Other non-current liabilities | 15.8 | 22.7 | 22.7 | 19.3 | 17.3 | 14.3 | 11.7 | 10.5 |
| Total non-current liabilities | 1,683.8 | 942.2 | 1,036.4 | 860.5 | 722.9 | 441.0 | 408.1 | 365.6 |
| |
| Equity (Deficit): | | | | | | | | |
| Total equity (deficit) | -110.7 | -104.0 | -108.3 | -151.1 | -134.8 | -29.2 | -13.3 | -11.0 |
| Total liabilities and deficit | 1,679.3 | 935.1 | 956.4 | 744.4 | 624.6 | 443.5 | 415.5 | 375.3 |