CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities
Net income	$ 620.6	$ 617.8	$ 484.9
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation expense	181.3	165.6	156.9
(Gain) loss on sale of property, plant and equipment			(0.1)
(Gain) loss on interest rate swaps			(0.4)
(Income) loss from equity investments	(5.3)	(10.6)	(10.3)
Distributions from equity investments	13.0	17.4	9.7
Amortization of deferred financing costs	8.8	7.3	6.5
Equity-based compensation expense	1.6	1.4	1.5
Deferred income tax expense (benefit)	26.6	14.6	7.3
Changes in assets and liabilities:
Accounts receivable – affiliate	(2.6)	(27.0)	(5.0)
Other current and noncurrent assets	3.5	(5.1)	(0.7)
Accounts payable – trade	8.1	(3.1)	(0.6)
Accounts payable – affiliate	(5.8)	9.7	0.1
Accrued liabilities	9.1	9.2	(11.4)
Other current and noncurrent liabilities	2.2	(1.7)	3.3
Net cash provided by (used in) operating activities	861.1	795.5	641.7
Cash flows from investing activities
Additions to property, plant and equipment	(238.2)	(163.2)	(301.1)
Proceeds from sale of property, plant and equipment			0.1
Net cash provided by (used in) investing activities	(238.2)	(163.2)	(301.0)
Cash flows from financing activities
Net proceeds from (repayments of) bank borrowings with maturities of 90 days or less	(86.0)	(80.0)	152.0
Bank borrowings with maturities of greater than 90 days
Borrowings	20.0
Repayments	(10.0)	(10.0)
Proceeds from issuance of senior notes	400.0	750.0
Financing costs	(13.3)	(11.6)	(1.3)
Transaction costs	(1.5)	(2.1)
Class B unit repurchase	(400.0)	(750.0)
Distributions to shareholders/unitholders	(91.0)	(49.4)	(31.6)
Distributions to noncontrolling interest	(440.2)	(479.6)	(462.1)
Capital contributions (distributions) to Hess associated with acquisitions			1.6
Net cash provided by (used in) financing activities	(622.0)	(632.7)	(341.4)
Increase (decrease) in cash and cash equivalents	0.9	(0.4)	(0.7)
Cash and cash equivalents, beginning of period	2.2	2.6	3.3
Cash and cash equivalents, end of period	3.1	2.2	2.6
Supplemental disclosure of non-cash investing and financing activities:
(Increase) decrease in accrued capital expenditures and related liabilities	6.5	(19.8)	48.1
Recognition of deferred tax asset	86.4	89.0
Tioga System Acquisition contingent liability adjustment	$ (2.9)	$ (4.1)	$ (3.0)