CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Operating Activities:
Net income	$ 206.6	$ 164.8
Adjustments to reconcile net income to cash provided by operations:
Depreciation and amortization	105.5	105.5
Amortization of deferred costs and other	3.9	1.8
Gain on sale of assets, impairments and other	(1.0)	(7.7)
Changes in operating assets and liabilities:
Trade and other receivables	(8.0)	36.2
Gas receivables and payables and product inventory	(5.1)	(12.3)
Prepayments and other assets	7.7	4.3
Trade and other payables	(13.3)	(19.5)
Other payables, affiliates	0.0	0.1
Accrued liabilities	(52.9)	(29.9)
Other liabilities	0.5	5.9
Net cash provided by operating activities	243.9	249.2
Investing Activities:
Capital expenditures	(51.6)	(97.3)
Proceeds from sale of operating assets	0.1	0.2
Advances to affiliates	(0.7)	0.0
Purchases of short-term investments	0.0	(244.2)
Net cash used in investing activities	(52.2)	(341.3)
Financing Activities:
Proceeds from long-term debt, net of issuance cost	0.0	594.2
Proceeds from borrowings on revolving credit facility	0.0	170.0
Repayments of borrowings on revolving credit facility	0.0	(195.0)
Principal payment of finance lease obligation	(0.2)	(0.2)
Advances from affiliates	0.8	0.0
Distributions paid	(75.0)	(50.0)
Net cash (used in) provided by financing activities	(74.4)	519.0
Increase in cash and cash equivalents	117.3	426.9
Cash and cash equivalents at beginning of period	117.9	20.1
Cash and cash equivalents at end of period	$ 235.2	$ 447.0