CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Assets
Cash and cash equivalents	$ 6.1	$ 4.3
Accounts receivable from contracts with customers:
Accounts receivable-trade	4.0	3.6
Accounts receivable-affiliate	$ 136.7	$ 135.3
Accounts Receivable, after Allowance for Credit Loss, Current, Related Party, Name [Extensible Enumeration]	us-gaap:RelatedPartyMember	us-gaap:RelatedPartyMember
Other current assets	$ 3.3	$ 6.2
Total current assets	150.1	149.4
Equity investments	85.5	87.0
Property, plant and equipment, net	3,324.4	3,325.4
Long-term receivable—affiliate		0.2
Deferred tax asset	697.5	582.6
Other noncurrent assets	6.1	6.4
Total assets	4,263.6	4,151.0
Liabilities
Accounts payable—trade	25.5	55.9
Accounts payable-affiliate	$ 39.7	$ 33.5
Accounts Payable, Current, Related Party, Name [Extensible Enumeration]	us-gaap:RelatedPartyMember	us-gaap:RelatedPartyMember
Accrued liabilities	$ 91.8	$ 93.8
Current maturities of long-term debt	25.0	22.5
Other current liabilities	4.1	13.6
Total current liabilities	186.1	219.3
Long-term debt	3,546.8	3,449.4
Deferred tax liability	0.5	0.5
Other noncurrent liabilities	17.3	16.5
Total liabilities	3,750.7	3,685.7
Partners' capital
Total Class A and Class B partners' capital	601.3	530.7
Noncontrolling interest	(88.4)	(65.4)
Total partners' capital	512.9	465.3
Total liabilities and partners' capital	4,263.6	4,151.0
Class A Shares
Partners' capital
Common unitholders	$ 601.3	$ 530.7