| In millions, except per share items | Mar-31-19 | Dec-31-18 | Sep-30-18 | Jun-30-18 | Mar-31-18 | Dec-31-17 | Sep-30-17 | Jun-30-17 |
| | 10-Q | 10-K | 10-Q/A | 10-Q | 10-Q | 10-K | 10-Q/A | 10-Q |
| Cash flows from operating activities | | | | | | | | |
| Net income | 19.0 | | -48.8 | 23.9 | 17.8 | | 4.5 | 10.1 |
| |
| Adjustments to reconcile net income to net cash from operating activities: | | | | | | | | |
| Depreciation | 12.2 | | -23.6 | 12.0 | 11.6 | | -25.7 | 13.0 |
| Amortization of deferred financing costs | 0.4 | | -2.1 | 1.1 | 1.1 | | -2.0 | 1.0 |
| Allowance for funds used during construction - other funds | | | 1.1 | -0.4 | -0.7 | | | |
| Equity based compensation | 0.1 | | -0.3 | 0.2 | 0.1 | | -0.3 | 0.1 |
| Changes in assets and liabilities: | | | | | | | | |
| Due from affiliates | 5.0 | | -2.7 | 0.2 | 2.6 | | -5.2 | -0.3 |
| Inventory | 0.0 | | 0.5 | -0.4 | -0.1 | | -0.6 | 0.1 |
| Prepaids and other current assets | -1.6 | | 0.2 | 0.4 | -0.6 | | 0.3 | 0.4 |
| Accounts payable and accrued liabilities | 1.2 | | 3.4 | -6.5 | 3.2 | | -2.0 | 1.8 |
| Net cash provided by operating activities | 36.4 | | -41.8 | 30.4 | 34.8 | | 4.9 | 26.3 |
| |
| Cash flows from investing activities | | | | | | | | |
| Additions to electric plant | -11.4 | | 31.7 | -16.7 | -15.0 | | 91.6 | -39.4 |
| Proceeds from asset exchange transaction | | | -1.6 | | 1.6 | | | |
| Net cash used in investing activities | -11.4 | | 23.3 | -16.7 | -13.4 | | 87.8 | -39.4 |
| |
| Cash flows from financing activities | | | | | | | | |
| Proceeds from short-term borrowings | 22.0 | | -92.5 | 80.5 | 12.0 | | -65.5 | 31.5 |
| Repayments of short-term borrowings | -28.0 | | 18.0 | -16.5 | -17.5 | | 193.0 | -193.5 |
| Repayments of long-term debt | -2.2 | | 64.1 | -62.1 | -2.0 | | 3.9 | -1.9 |
| Dividends and distributions paid | -15.2 | | 30.3 | -15.2 | -15.2 | | 30.3 | -15.2 |
| Net cash used in financing activities | -23.3 | | 11.3 | -13.2 | -22.7 | | -60.3 | 20.1 |
| Net increase (decrease) in cash, cash equivalents and restricted cash | 1.7 | | | | -1.2 | | | |