| In millions, except per share items | Sep-30-18 | Jun-30-18 | Mar-31-18 | Dec-31-17 | Sep-30-17 | Jun-30-17 | Mar-31-17 | Dec-31-16 |
| | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K |
| Cash flows from operating activities: | | | | | | | | |
| Net income | 322.1 | 203.7 | 176.0 | 146.0 | 142.4 | 138.6 | 142.0 | 135.0 |
| Adjustments to reconcile net income to net cash from operating activities: | | | | | | | | |
| Depreciation | 71.5 | 55.5 | | | 22.2 | 41.9 | | |
| Amortization of intangible assets | 10.4 | 20.8 | | | | | | |
| Equity income | -16.1 | -10.9 | -8.8 | -6.8 | -6.0 | -5.1 | -4.3 | -3.8 |
| AFUDC – equity | -1.4 | -1.1 | -1.1 | -1.0 | -0.8 | -1.6 | -1.7 | -2.7 |
| Non-cash long-term compensation expense | 1.0 | | 0.6 | | | | 0.5 | |
| Changes in other assets and liabilities: | | | | | | | | |
| Accounts receivable | 1.5 | 1.4 | -0.7 | -7.0 | -0.5 | 0.4 | -1.0 | -5.4 |
| Accounts payable | 20.2 | 10.7 | -2.7 | 3.0 | -0.6 | 2.0 | 0.4 | -21.0 |
| Due to/from EQT affiliates | -0.1 | -5.1 | -6.5 | -4.0 | 5.1 | 1.8 | 0.4 | 25.5 |
| Other assets and other liabilities | 14.0 | 6.6 | 1.8 | 4.8 | -1.9 | 1.4 | 3.9 | 10.1 |
| Net cash provided by operating activities | 422.9 | 258.3 | 181.8 | | 159.9 | 158.9 | 160.8 | |
| |
| Cash flows from investing activities: | | | | | | | | |
| Capital expenditures | -313.5 | -218.9 | -84.0 | -77.0 | -75.2 | -86.5 | -62.9 | -107.2 |
| Capital contributions to the MVP Joint Venture | -263.2 | -65.8 | -117.0 | 103.4 | -43.5 | -40.2 | -19.8 | 76.3 |
| May 2018 Acquisition from EQT | | -1,193.2 | | | -43.5 | -59.9 | | |
| Principal payments received on the Preferred Interest | 1.1 | 1.1 | 1.1 | 1.1 | 1.0 | 1.0 | 1.0 | |
| Net cash used in investing activities | -575.6 | -1,476.7 | -200.0 | -457.0 | -117.6 | -125.6 | -81.7 | -732.0 |
| |
| Cash flows from financing activities: | | | | | | | | |
| Proceeds from credit facility borrowings of EQM and RMP | 523.5 | 1,746.5 | 254.0 | | 184.0 | 100.0 | 50.0 | |
| Payments on credit facility borrowings of EQM and RMP | -787.5 | -2,063.5 | -117.0 | 229.0 | -119.0 | -60.0 | -50.0 | 638.0 |
| Proceeds from EQM's issuance of long-term debt | | 2,500.0 | | | | | | |
| EQM debt discount and issuance costs | -4.0 | -30.3 | | | -2.3 | | | -8.6 |
| Net proceeds from / (payments on) the EQGP Working Capital Facility | 0.2 | -0.1 | 0.0 | 0.1 | 0.0 | -0.1 | 0.1 | |
| Distributions paid to EQGP unitholders | -92.6 | -68.7 | -64.9 | | -55.9 | -50.8 | -47.1 | |
| Acquisition of 25% of Strike Force Midstream LLC | | -175.0 | | | | | | |
| Capital contributions | | 2.8 | 12.9 | 2.8 | | | 0.2 | |
| Net contributions from EQT | | 3.7 | | | | | | |
| Net cash provided by (used in) financing activities | -536.2 | 1,852.0 | 24.6 | -248.5 | -48.1 | -63.3 | -96.8 | -103.8 |
| Net change in cash and cash equivalents | -688.9 | 633.7 | 6.4 | -4.1 | -5.9 | -30.0 | -17.7 | 60.2 |
| Cash and cash equivalents at beginning of period | 10.5 | 41.5 | 2.9 | | | | 60.5 | |
| Cash and cash equivalents at end of period | -678.4 | 675.2 | 9.3 | -4.1 | -5.9 | -30.0 | 42.8 | 60.2 |
| |
| Cash paid during the period for: | | | | | | | | |
| Interest, net of amount capitalized | 12.7 | 18.4 | 11.6 | 10.9 | 10.1 | 11.6 | 9.4 | -1.5 |
| Non-cash activity during the period for: | | | | | | | | |
| (Decrease) increase in capital contribution receivable from EQT | 0.5 | -2.2 | -10.1 | | | | 0.8 | |