CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Current Assets:
Cash and cash equivalents	$ 8.5	$ 17.6
Receivables:
Trade, net	97.4	116.8
Other	28.6	16.6
Gas transportation receivables	5.1	4.6
Prepayments	22.7	17.9
Other current assets	9.0	7.1
Total current assets	171.3	180.6
Property, Plant and Equipment:
Natural gas transmission and other plant	10,798.1	10,467.1
Construction work in progress	297.7	416.5
Property, plant and equipment, gross	11,095.8	10,883.6
Less—accumulated depreciation and amortization	2,779.2	2,621.1
Property, plant and equipment, net	8,316.6	8,262.5
Other Assets:
Goodwill	237.4	237.4
Gas stored underground	85.8	86.3
Other	138.7	139.8
Total other assets	461.9	463.5
Total Assets	8,949.8	8,906.6
Payables:
Trade	73.4	76.0
Affiliates	1.6	1.5
Other	12.2	11.9
Gas payables	8.3	5.7
Accrued taxes, other	62.8	57.1
Accrued interest	37.3	37.9
Accrued payroll and employee benefits	24.2	33.7
Construction retainage	22.6	32.4
Deferred income	1.7	1.9
Other current liabilities	19.9	22.3
Total current liabilities	264.0	280.4
Long-term debt and capital lease obligation	3,654.1	3,686.8
Other Liabilities and Deferred Credits:
Pension liability	21.8	21.8
Asset retirement obligation	49.2	46.0
Provision for other asset retirement	68.7	65.8
Payable to affiliate	0.0	16.0
Other	73.4	65.0
Total other liabilities and deferred credits	213.1	214.6
Commitments and Contingencies
Partners’ Capital:
Common units - 250.3 million units issued and outstanding as of June 30, 2018, and December 31, 2017	4,803.0	4,713.1
General partner	94.3	92.7
Accumulated other comprehensive loss	(78.7)	(81.0)
Total partners’ capital	4,818.6	4,724.8
Total Liabilities and Partners' Capital	$ 8,949.8	$ 8,906.6