CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Operating Activities:
Net income	$ 230.3	$ 239.8
Adjustments to reconcile net income to cash provided by operations:
Depreciation and amortization	294.0	274.1
Amortization of deferred costs and other	2.8	6.0
Loss (gain) on sale of assets and impairments	7.1	(0.2)
Changes in operating assets and liabilities:
Trade and other receivables	15.7	11.8
Gas transportation receivables and storage assets	(66.9)	(23.1)
Other assets	(7.3)	(6.1)
Trade and other payables	9.9	2.8
Other payables, affiliates	(0.2)	0.0
Gas transportation payables	3.7	6.5
Accrued liabilities	25.0	24.9
Regulatory assets and liabilities	69.1	(8.0)
Other liabilities	(1.5)	(1.6)
Net cash provided by operating activities	581.7	526.9
Investing Activities:
Capital expenditures	(208.0)	(238.7)
Proceeds from sale of operating assets	1.0	0.5
Advances to affiliates	(2.7)	(1.8)
Net cash used in investing activities	(209.7)	(240.0)
Financing Activities:
Proceeds from long-term debt, net of issuance cost	495.0	0.0
Repayment of borrowings from long-term debt	(300.0)	0.0
Proceeds from borrowings on revolving credit facility	0.0	150.0
Repayment of borrowings on revolving credit facility, including financing fees	(0.6)	(284.4)
Principal payment of finance lease obligation	(0.6)	(0.6)
Advances from affiliates	3.0	(7.8)
Net cash provided by (used in) financing activities	196.8	(142.8)
Increase in cash and cash equivalents	568.8	144.1
Cash and cash equivalents at beginning of period	39.1	2.9
Cash and cash equivalents at end of period	$ 607.9	$ 147.0