CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Assets
Cash and cash equivalents	$ 4.5	$ 4.3
Accounts receivable from contracts with customers:
Accounts receivable-trade	5.6	3.6
Accounts receivable-affiliate	$ 138.4	$ 135.3
Accounts Receivable, after Allowance for Credit Loss, Current, Related Party, Name [Extensible Enumeration]	us-gaap:RelatedPartyMember	us-gaap:RelatedPartyMember
Other current assets	$ 2.4	$ 6.2
Total current assets	150.9	149.4
Equity investments	84.8	87.0
Property, plant and equipment, net	3,344.7	3,325.4
Long-term receivable—affiliate	0.0	0.2
Deferred tax asset	837.3	582.6
Other noncurrent assets	5.4	6.4
Total assets	4,423.1	4,151.0
Liabilities
Accounts payable—trade	32.4	55.9
Accounts payable-affiliate	$ 44.2	$ 33.5
Accounts Payable, Current, Related Party, Name [Extensible Enumeration]	us-gaap:RelatedPartyMember	us-gaap:RelatedPartyMember
Accrued liabilities	$ 102.2	$ 93.8
Current maturities of long-term debt	27.5	22.5
Other current liabilities	7.2	13.6
Total current liabilities	213.5	219.3
Long-term debt	3,686.9	3,449.4
Deferred tax liability	0.5	0.5
Other noncurrent liabilities	14.6	16.5
Total liabilities	3,915.5	3,685.7
Partners' capital
Total Class A and Class B partners' capital	635.0	530.7
Noncontrolling interest	(127.4)	(65.4)
Total partners' capital	507.6	465.3
Total liabilities and partners' capital	4,423.1	4,151.0
Class A Shares
Partners' capital
Common unitholders	$ 635.0	$ 530.7