| In millions, except per share items | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 | Dec-31-14 | Dec-31-13 | Dec-31-12 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Cash flows from operating activities | | | | | | | |
| Net income | 85.2 | 17.1 | 69.3 | 19.9 | 29.8 | 42.4 | -0.1 |
| |
| Adjustments to reconcile net income to net cash from operating activities: | | | | | | | |
| Depreciation | 47.8 | 51.2 | 46.7 | 40.2 | 35.1 | 20.0 | |
| Amortization of deferred financing costs | 3.0 | 4.2 | 4.0 | 3.2 | 4.4 | 3.6 | |
| Allowance for funds used during construction - other funds | -1.1 | -0.7 | -3.7 | -3.0 | | | |
| Equity based compensation | 0.6 | 0.6 | 1.0 | 0.7 | 0.1 | | |
| Changes in assets and liabilities: | | | | | | | |
| Due from affiliates | -3.1 | -2.6 | -1.4 | -3.4 | -7.3 | -17.4 | |
| Inventory | -0.5 | 0.5 | -0.5 | 0.7 | -0.8 | -4.4 | |
| Prepaids and other current assets | -0.1 | -0.1 | -0.2 | 0.0 | -3.4 | -1.4 | |
| Accounts payable and accrued liabilities | -7.0 | -8.0 | 8.0 | 2.6 | 7.3 | -0.6 | 0.0 |
| Net cash provided by operating activities | 125.0 | 117.6 | 123.1 | 105.8 | 82.5 | 21.3 | -0.1 |
| |
| Cash flows from investing activities | | | | | | | |
| Additions to electric plant | -69.9 | -184.4 | -231.3 | -239.2 | -210.8 | -390.3 | |
| Proceeds from asset exchange transaction | 1.6 | 17.9 | | 41.2 | | | |
| Net cash used in investing activities | -68.2 | -166.5 | -231.3 | -369.3 | -210.8 | -390.3 | |
| |
| Cash flows from financing activities | | | | | | | |
| Proceeds from short-term borrowings | 162.5 | 138.5 | 139.5 | 87.0 | 354.0 | 85.0 | |
| Repayments of short-term borrowings | -91.0 | -235.0 | -56.0 | -253.0 | -210.0 | -15.0 | |
| Repayments of long-term debt | -68.3 | -7.8 | -7.4 | -404.9 | -13.9 | -8.2 | |
| Dividends and distributions paid | -60.7 | -60.7 | -59.1 | -61.6 | | -12.2 | -0.1 |
| Net cash used in financing activities | -57.8 | 34.2 | 116.3 | 257.3 | 136.2 | 360.3 | -0.1 |