CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Assets
Cash and cash equivalents	$ 4.2	$ 5.4
Accounts receivable from contracts with customers:
Accounts receivable-trade	2.8	1.9
Accounts receivable-affiliate	$ 127.8	$ 122.5
Accounts Receivable, after Allowance for Credit Loss, Current, Related Party, Name [Extensible Enumeration]	us-gaap:RelatedPartyMember	us-gaap:RelatedPartyMember
Other current assets	$ 4.5	$ 7.0
Total current assets	139.3	136.8
Equity investments	89.4	90.2
Property, plant and equipment, net	3,215.0	3,229.2
Long-term receivable—affiliate	0.2	0.3
Deferred tax asset	410.5	324.4
Other noncurrent assets	8.4	8.6
Total assets	3,862.8	3,789.5
Liabilities
Accounts payable—trade	31.2	38.5
Accounts payable-affiliate	$ 21.2	$ 41.2
Accounts Payable, Current, Related Party, Name [Extensible Enumeration]	us-gaap:RelatedPartyMember	us-gaap:RelatedPartyMember
Accrued liabilities	$ 86.1	$ 105.9
Current maturities of long-term debt	15.0	12.5
Other current liabilities	3.7	12.1
Total current liabilities	157.2	210.2
Long-term debt	3,310.4	3,198.9
Deferred tax liability	0.4	0.5
Other noncurrent liabilities	13.1	16.7
Total liabilities	3,481.1	3,426.3
Partners' capital
Total Class A and Class B partners' capital	404.3	340.2
Noncontrolling interest	(22.6)	23.0
Total partners' capital	381.7	363.2
Total liabilities and partners' capital	3,862.8	3,789.5
Class A Shares
Partners' capital
Common unitholders	$ 404.3	$ 340.2