| In millions, except per share items | Jun-30-23 | Jun-05-23 | Mar-31-23 | Mar-05-23 | Dec-05-22 | Jun-30-22 | Jun-05-22 | Mar-31-22 |
| | 10-Q | 8-K | 10-Q | 8-K | 8-K | 10-Q | 8-K | 10-Q |
| Revenues | | | | | | | | |
| Total revenue | 432.4 | 432.4 | 211.1 | 211.1 | 455.1 | 622.9 | 622.9 | 591.7 |
| Total revenue growth | -30.6% | -30.6% | -64.3% | -64.3% | 34.3% | 223.1% | | 259.0% |
| Operating expenses | | | | | | | | |
| Cost of revenue and vessel operating expenses (exclusive of items below) | 48.7 | 48.7 | 58.8 | 58.8 | 50.2 | 58.7 | 58.7 | 50.1 |
| Direct cost of gas sales | 277.7 | 277.7 | 55.2 | 55.2 | 300.1 | 485.0 | 485.0 | 463.4 |
| Depreciation and amortization | 30.8 | 30.8 | 25.2 | 25.2 | 24.6 | 24.3 | 24.3 | 23.7 |
| Selling, general and administrative expenses | 21.6 | | 22.3 | | | 13.1 | | 12.6 |
| Restructuring, transition and transaction expenses | | | | | | 2.6 | | 2.8 |
| Total operating expenses | 378.7 | 378.7 | 161.5 | 161.5 | 46.2 | 583.6 | 583.6 | 552.5 |
| Operating Income | 53.7 | 53.7 | 49.6 | 49.6 | 58.4 | 39.3 | 39.3 | 39.1 |
| Operating margin | 12.4% | 12.4% | 23.5% | 23.5% | 12.8% | 6.3% | 6.3% | 6.6% |
| |
| Other income (expense) | | | | | | | | |
| Interest expense | -13.5 | | -12.0 | | | -7.8 | | -7.1 |
| Interest expense - related party | -3.6 | | -3.6 | | | -5.5 | | -12.2 |
| Earnings from equity method investment | 0.4 | 0.4 | 0.4 | 0.4 | 0.6 | 0.7 | 0.7 | 0.8 |
| Early extinguishment of lease liability on vessel acquisition | | | | | | -21.8 | | |
| Other income (expense), net | 2.3 | | 3.9 | | | -1.1 | | -4.1 |
| Income before income taxes | 39.3 | | 38.3 | | | 3.8 | | 16.6 |
| Provision for income taxes | -9.7 | -9.7 | -7.6 | -7.6 | -16.6 | -7.8 | -7.8 | -3.7 |
| Net income (loss) | 29.6 | | 30.7 | | | -4.0 | | 12.8 |
| Less net income (loss) attributable to non-controlling interest | 23.6 | 23.6 | 23.9 | 23.9 | 28.2 | -0.8 | -0.8 | -0.8 |
| Net income (loss) attributable to shareholders | 6.0 | 29.6 | 6.8 | 30.7 | 6.5 | -2.0 | -4.0 | |
| |
| Net income (loss) per common share - basic | $0.23 | $0.23 | $0.26 | $0.26 | $0.25 | ($0.08) | ($0.08) | |
| Net income (loss) per common share - diluted | $0.23 | $0.23 | $0.26 | $0.26 | $0.25 | ($0.08) | ($0.08) | |
| |
| Weighted average shares outstanding - basic | 26.3 | 26.3 | 26.3 | 26.3 | 26.3 | 26.3 | 26.3 | |
| Weighted average shares outstanding - diluted | 26.3 | 26.3 | 26.3 | 26.3 | 26.3 | 26.3 | 26.3 | |