| 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 | 847.8 | 668.1 | 602.9 | 568.9 | 558.0 | 548.7 | 541.2 | 535.0 |
| Adjustments to reconcile net income to net cash from operating activities: | | | | | | | | |
| Depreciation | 127.0 | 77.7 | | | 64.2 | 41.9 | | |
| Amortization of intangible assets | 31.2 | 20.8 | | | | | | |
| Equity income | -42.6 | -32.5 | -26.7 | -22.2 | -19.2 | -15.8 | -12.6 | -9.9 |
| AFUDC – equity | -4.6 | -4.0 | -4.5 | -5.1 | -6.8 | -14.0 | -18.2 | -19.4 |
| Non-cash long-term compensation expense | 1.6 | | 0.6 | | | | 0.5 | |
| Changes in other assets and liabilities: | | | | | | | | |
| Accounts receivable | -4.8 | -6.8 | -7.9 | -8.1 | -6.5 | -5.1 | -3.3 | -2.9 |
| Accounts payable | 31.1 | 10.4 | 1.7 | 4.8 | -19.1 | -12.5 | -8.9 | -9.4 |
| Due to/from EQT affiliates | -15.8 | -10.6 | -3.7 | 3.2 | 32.7 | -5.3 | -5.2 | -34.1 |
| Other assets and other liabilities | 27.2 | 11.3 | 6.2 | 8.3 | 13.6 | 4.6 | 11.9 | 4.2 |
| Net cash provided by operating activities | 863.0 | 600.0 | 500.6 | | 479.6 | 319.7 | 160.8 | |
| |
| Cash flows from investing activities: | | | | | | | | |
| Capital expenditures | -693.4 | -455.0 | -322.7 | -301.6 | -331.8 | -425.5 | -523.1 | -584.8 |
| Capital contributions to the MVP Joint Venture | -342.6 | -122.9 | -97.3 | 0.0 | -27.2 | -19.3 | -8.3 | 0.0 |
| May 2018 Acquisition from EQT | | -1,236.7 | | | -103.4 | -59.9 | | |
| Principal payments received on the Preferred Interest | 4.3 | 4.3 | 4.2 | 4.2 | 3.1 | 2.1 | 1.0 | |
| Net cash used in investing activities | -2,709.3 | -2,251.3 | -900.2 | -781.9 | -1,057.0 | -939.3 | -813.7 | -732.0 |
| |
| Cash flows from financing activities: | | | | | | | | |
| Proceeds from credit facility borrowings of EQM and RMP | 2,524.0 | 2,184.5 | 538.0 | | 334.0 | 320.0 | 409.0 | |
| Payments on credit facility borrowings of EQM and RMP | -2,739.0 | -2,070.5 | -67.0 | 0.0 | 409.0 | 449.0 | 311.0 | 0.0 |
| Proceeds from EQM's issuance of long-term debt | | 2,500.0 | | | | | | |
| EQM debt discount and issuance costs | -34.2 | -32.6 | | | -10.8 | | | -8.6 |
| Net proceeds from / (payments on) the EQGP Working Capital Facility | 0.1 | -0.1 | -0.1 | 0.0 | -0.1 | -0.1 | 0.0 | |
| Distributions paid to EQGP unitholders | -226.2 | -189.5 | -171.7 | | -153.8 | -97.9 | -47.1 | |
| Acquisition of 25% of Strike Force Midstream LLC | | -175.0 | | | | | | |
| Capital contributions | | 18.5 | 15.7 | 3.1 | | | 6.1 | |
| Net contributions from EQT | | 3.7 | | | | | | |
| Net cash provided by (used in) financing activities | 1,092.0 | 1,580.1 | -335.2 | -456.6 | -312.0 | -263.9 | -200.6 | -103.8 |
| Net change in cash and cash equivalents | -52.9 | 630.2 | -33.5 | -57.6 | 6.7 | -71.6 | 42.4 | -300.5 |
| Cash and cash equivalents at beginning of period | 54.9 | 44.4 | 2.9 | | | | 60.5 | |
| Cash and cash equivalents at end of period | 2.0 | 674.5 | -30.6 | 2.9 | 67.1 | -11.1 | 102.8 | 60.5 |
| |
| Cash paid during the period for: | | | | | | | | |
| Interest, net of amount capitalized | 53.5 | 50.9 | 44.1 | 42.0 | 29.6 | 26.4 | 13.6 | 13.9 |
| Non-cash activity during the period for: | | | | | | | | |
| (Decrease) increase in capital contribution receivable from EQT | -11.8 | -12.3 | -10.1 | | | | | |