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Acquisitions - Consolidated Statements of Cash Flows (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | [1] | Mar. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Cash flows from operating activities |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ 115.8 | $ 107.8 | $ 129.0 | $ 87.4 | [1] | $ 74.4 | $ 80.8 | [1] | $ 352.6 | $ 242.6 | [1] |  |
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation expense |  | 39.5 |  |  | 36.0 | [1] |  |  |  | 116.9 | 105.0 | [1] |  |
(Gain) loss on interest rate swaps |  |  |  |  |  |  |  |  |  | (0.4) | (0.6) | [1] |  |
Amortization of deferred financing costs |  |  |  |  |  |  |  |  |  | 5.1 | 3.8 | [1] |  |
Equity-based compensation expense |  |  |  |  |  |  |  |  |  | 1.2 | 1.1 | [1] |  |
Changes in assets and liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable – affiliate |  |  |  |  |  |  |  |  |  | (4.9) | (7.6) | [1] |  |
Other current and noncurrent assets |  |  |  |  |  |  |  |  |  | (3.4) | (4.7) | [1] |  |
Accounts payable – trade |  |  |  |  |  |  |  |  |  | 9.5 | 3.7 | [1] |  |
Accounts payable – affiliate |  |  |  |  |  |  |  |  |  | (0.5) | (1.5) | [1] |  |
Accrued liabilities |  |  |  |  |  |  |  |  |  | (12.6) |  |  |  |
Other current and noncurrent liabilities |  |  |  |  |  |  |  |  |  | (1.0) | (2.8) | [1] |  |
Net cash provided by (used in) operating activities |  |  |  |  |  |  |  |  |  | 467.2 | 334.4 | [1] |  |
(Income) loss from equity investments |  | (3.6) |  |  | (0.5) | [1] |  |  |  | (7.2) | (0.5) | [1] |  |
(Increase) decrease in capitalized interest | [1] |  |  |  |  |  |  |  |  |  | 4.1 |  |  |
Cash flows from investing activities |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for equity investments | [1] |  |  |  |  |  |  |  |  |  | (33.0) |  |  |
Acquisitions from Hess |  |  |  |  |  |  |  |  |  |  | (68.9) |  |  |
Acquisitions | [1] |  |  |  |  |  |  |  |  |  | (89.2) |  |  |
Additions to property, plant and equipment |  |  |  |  |  |  |  |  |  | (246.0) | (194.9) | [1] |  |
Net cash provided by (used in) investing activities |  |  |  |  |  |  |  |  |  | (245.9) | (386.0) | [1] |  |
Cash flows from financing activities |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from (repayments of) bank borrowings with maturities of 90 days or less |  |  |  |  |  |  |  |  |  | 146.0 | 176.0 | [1] |  |
Repayments of bank borrowings with maturities of greater than 90 days | [1] |  |  |  |  |  |  |  |  |  | (7.5) |  |  |
Capital distribution to Hess associated with acquisitions | [1] |  |  |  |  |  |  |  |  |  | (156.1) |  |  |
Distributions to shareholders/unitholders |  |  |  |  |  |  |  |  |  | (23.5) | (63.0) | [1] |  |
Distributions to noncontrolling interest |  |  |  |  |  |  |  |  |  | (344.4) |  |  |  |
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  |  | (221.6) | (50.6) | [1] |  |
Increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  |  | (0.3) | (102.2) | [1] |  |
Cash and cash equivalents, beginning of period |  |  |  | $ 3.3 |  |  |  | 109.3 | [1] | 3.3 | 109.3 | [1] | $ 109.3 | [1]
Cash and cash equivalents, end of period |  | $ 3.0 |  |  | 7.1 | [1] |  |  |  | $ 3.0 | 7.1 | [1] | 3.3 |
Partnership as Previously Reported |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash flows from operating activities |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  | 100.4 |  |  |  |  |  | 286.6 |  |  |
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation expense |  |  |  |  | 34.5 |  |  |  |  |  | 101.1 |  |  |
Amortization of deferred financing costs |  |  |  |  |  |  |  |  |  |  | 0.9 |  |  |
Equity-based compensation expense |  |  |  |  |  |  |  |  |  |  | 1.1 |  |  |
Changes in assets and liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable – affiliate |  |  |  |  |  |  |  |  |  |  | (5.2) |  |  |
Other current and noncurrent assets |  |  |  |  |  |  |  |  |  |  | (5.0) |  |  |
Accounts payable – trade |  |  |  |  |  |  |  |  |  |  | 2.2 |  |  |
Accounts payable – affiliate |  |  |  |  |  |  |  |  |  |  | 4.3 |  |  |
Accrued liabilities |  |  |  |  |  |  |  |  |  |  | 9.2 |  |  |
Other current and noncurrent liabilities |  |  |  |  |  |  |  |  |  |  | (2.5) |  |  |
Net cash provided by (used in) operating activities |  |  |  |  |  |  |  |  |  |  | 392.2 |  |  |
(Income) loss from equity investments |  |  |  |  | (0.5) |  |  |  |  |  | (0.5) |  |  |
Cash flows from investing activities |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for equity investments |  |  |  |  |  |  |  |  |  |  | (33.0) |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  | (61.0) |  |  |
Additions to property, plant and equipment |  |  |  |  |  |  |  |  |  |  | (184.4) |  |  |
Net cash provided by (used in) investing activities |  |  |  |  |  |  |  |  |  |  | (278.4) |  |  |
Cash flows from financing activities |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from (repayments of) bank borrowings with maturities of 90 days or less |  |  |  |  |  |  |  |  |  |  | 11.0 |  |  |
Distributions to shareholders/unitholders |  |  |  |  |  |  |  |  |  |  | (63.0) |  |  |
Distributions to general partner |  |  |  |  |  |  |  |  |  |  | (2.5) |  |  |
Distributions to noncontrolling interest |  |  |  |  |  |  |  |  |  |  | (152.4) |  |  |
Contributions from noncontrolling interest |  |  |  |  |  |  |  |  |  |  | 76.3 |  |  |
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  |  |  | (130.6) |  |  |
Increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  |  |  | (16.8) |  |  |
Cash and cash equivalents, beginning of period |  |  |  |  |  |  |  | 20.3 |  |  | 20.3 |  | 20.3 |
Cash and cash equivalents, end of period |  |  |  |  | 3.5 |  |  |  |  |  | 3.5 |  |  |
Restatement Adjustment | Acquisition of HIP |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash flows from operating activities |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  | (13.0) |  |  |  |  |  | (44.0) |  |  |
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation expense |  |  |  |  | 1.5 |  |  |  |  |  | 3.9 |  |  |
(Gain) loss on interest rate swaps |  |  |  |  |  |  |  |  |  |  | (0.6) |  |  |
Amortization of deferred financing costs |  |  |  |  |  |  |  |  |  |  | 2.9 |  |  |
Changes in assets and liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable – affiliate |  |  |  |  |  |  |  |  |  |  | (2.4) |  |  |
Other current and noncurrent assets |  |  |  |  |  |  |  |  |  |  | 0.3 |  |  |
Accounts payable – trade |  |  |  |  |  |  |  |  |  |  | 1.5 |  |  |
Accounts payable – affiliate |  |  |  |  |  |  |  |  |  |  | (5.8) |  |  |
Accrued liabilities |  |  |  |  |  |  |  |  |  |  | (9.2) |  |  |
Other current and noncurrent liabilities |  |  |  |  |  |  |  |  |  |  | (0.3) |  |  |
Net cash provided by (used in) operating activities |  |  |  |  |  |  |  |  |  |  | (57.8) |  |  |
(Increase) decrease in capitalized interest |  |  |  |  |  |  |  |  |  |  | 4.1 |  |  |
Cash flows from investing activities |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions from Hess |  |  |  |  |  |  |  |  |  |  | (68.9) |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  | (28.2) |  |  |
Additions to property, plant and equipment |  |  |  |  |  |  |  |  |  |  | (10.5) |  |  |
Net cash provided by (used in) investing activities |  |  |  |  |  |  |  |  |  |  | (107.6) |  |  |
Cash flows from financing activities |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from (repayments of) bank borrowings with maturities of 90 days or less |  |  |  |  |  |  |  |  |  |  | 165.0 |  |  |
Repayments of bank borrowings with maturities of greater than 90 days |  |  |  |  |  |  |  |  |  |  | (7.5) |  |  |
Capital distribution to Hess associated with acquisitions |  |  |  |  |  |  |  |  |  |  | (156.1) |  |  |
Distributions to general partner |  |  |  |  |  |  |  |  |  |  | 2.5 |  |  |
Distributions to noncontrolling interest |  |  |  |  |  |  |  |  |  |  | 152.4 |  |  |
Contributions from noncontrolling interest |  |  |  |  |  |  |  |  |  |  | (76.3) |  |  |
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  |  |  | 80.0 |  |  |
Increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  |  |  | (85.4) |  |  |
Cash and cash equivalents, beginning of period |  |  |  |  |  |  |  | $ 89.0 |  |  | 89.0 |  | $ 89.0 |
Cash and cash equivalents, end of period |  |  |  |  | $ 3.6 |  |  |  |  |  | $ 3.6 |  |  |
[1] | The financial information presented in this report has been retrospectively adjusted for the acquisition of Hess Infrastructure Partners LP.

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