CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Cash flows from operating activities
Net income	$ 161.4	$ 161.9
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation expense	51.5	49.8
Income from equity investments	(3.4)	(2.7)
Distributions from equity investments	4.9	3.5
Amortization of deferred financing costs	4.9	2.1
Equity-based compensation expense	0.3	0.5
Deferred income tax expense	22.9	14.2
Changes in assets and liabilities:
Accounts receivable - trade	(0.4)	(0.9)
Accounts receivable – affiliate	(1.2)	(5.2)
Other current and noncurrent assets	2.7	2.1
Accounts payable – trade	(31.2)	(7.3)
Accounts payable – affiliate	(4.4)	(15.8)
Accrued liabilities	3.4	(4.7)
Other current and noncurrent liabilities	(9.0)	(12.2)
Net cash provided by operating activities	202.4	185.3
Cash flows from investing activities
Additions to property, plant and equipment	(45.5)	(54.8)
Net cash used in investing activities	(45.5)	(54.8)
Cash flows from financing activities
Net proceeds from (repayments of) borrowings with maturities of 90 days or less	113.0	115.0
Borrowings with maturities of greater than 90 days:
Proceeds	800.0	0.0
Repayments	(805.0)	(2.5)
Deferred financing costs	(11.4)	0.0
Transaction costs	(0.6)	(0.6)
Class B unit repurchase	(100.0)	(100.0)
Distributions to shareholders/unitholders	(73.0)	(50.7)
Distributions to noncontrolling interest	(78.1)	(92.9)
Net cash used in financing activities	(155.1)	(131.7)
Increase (decrease) in cash and cash equivalents	1.8	(1.2)
Cash and cash equivalents, beginning of period	4.3	5.4
Cash and cash equivalents, end of period	6.1	4.2
Supplemental disclosure of non-cash investing and financing activities:
(Increase) decrease in accrued capital expenditures and related liabilities	(4.6)	19.6
Recognition of deferred tax asset	$ 137.8	$ 100.4