CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Current Assets:
Cash and cash equivalents	$ 235.2	$ 117.9
Receivables:
Trade, net	216.6	210.7
Other	21.7	21.4
Gas transportation receivables	21.7	7.4
Prepayments	18.3	25.2
Total current assets	531.9	401.1
Property, Plant and Equipment:
Property, plant and equipment, gross	13,898.6	13,857.8
Less—accumulated depreciation and amortization	5,146.1	5,045.1
Property, plant and equipment, net	8,752.5	8,812.7
Other Assets:
Goodwill	237.4	237.4
Gas stored underground	97.0	98.3
Other	230.8	229.9
Total other assets	565.2	565.6
Total Assets	9,849.6	9,779.4
Payables:
Trade	79.7	100.9
Gas transportation payables	14.2	11.7
Accrued taxes, other	43.3	67.0
Accrued interest	36.4	46.7
Accrued payroll and employee benefits	29.6	48.6
Regulatory liabilities	25.2	18.3
Other current liabilities	27.7	30.2
Total current liabilities	279.7	345.6
Long-term debt and finance lease obligation	3,235.1	3,234.4
Other Liabilities and Deferred Credits:
Asset retirement obligations	70.5	70.0
Provision for other asset retirement	105.6	103.6
Total other liabilities and deferred credits	296.9	293.4
Commitments and Contingencies
Partners' Capital:
Partners' capital	6,110.2	5,978.6
Accumulated other comprehensive loss	(72.3)	(72.6)
Total partners' capital	6,037.9	5,906.0
Total Liabilities and Partners' Capital	9,849.6	9,779.4
Affiliates
Receivables:
Other current assets	0.7	0.0
Payables:
Payables	0.5	0.5
Other Liabilities and Deferred Credits:
Other	5.6	4.8
Other
Receivables:
Other current assets	17.7	18.5
Payables:
Payables	23.1	21.7
Other Liabilities and Deferred Credits:
Other	115.2	115.0
Pipelines, storage and other plant
Property, Plant and Equipment:
Property, plant and equipment, gross	13,708.8	13,667.7
Construction work in progress
Property, Plant and Equipment:
Property, plant and equipment, gross	$ 189.8	$ 190.1