CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Current Assets:
Cash and cash equivalents	$ 22.6	$ 4.6
Receivables:
Trade, net	94.2	127.1
Other	14.0	12.7
Gas transportation receivables	6.2	8.2
Gas and liquids stored underground	5.6	1.3
Prepayments	19.8	17.7
Other current assets	0.8	2.6
Total current assets	163.2	174.2
Property, Plant and Equipment:
Natural gas transmission and other plant	10,112.5	9,958.8
Construction work in progress	562.2	368.5
Property, plant and equipment, gross	10,674.7	10,327.3
Less—accumulated depreciation and amortization	2,543.1	2,333.8
Property, plant and equipment, net	8,131.6	7,993.5
Other Assets:
Goodwill	237.4	237.4
Gas stored underground	92.5	93.5
Other	137.4	139.2
Total other assets	467.3	470.1
Total Assets	8,762.1	8,637.8
Payables:
Trade	78.2	113.8
Affiliates	1.5	1.4
Other	9.7	23.7
Gas payables	6.1	6.7
Accrued taxes, other	75.7	52.7
Accrued interest	38.7	40.6
Accrued payroll and employee benefits	28.1	38.5
Construction retainage	24.5	19.6
Deferred income	2.9	7.5
Other current liabilities	27.3	28.4
Total current liabilities	292.7	332.9
Long-term debt and capital lease obligation	3,585.7	3,558.0
Other Liabilities and Deferred Credits:
Pension liability	19.3	22.0
Asset retirement obligation	44.6	44.7
Provision for other asset retirement	64.6	63.7
Payable to affiliate	16.0	16.0
Other	71.0	69.6
Total other liabilities and deferred credits	215.5	216.0
Commitments and Contingencies
Partners’ Capital:
Common units - 250.3 million units issued and outstanding as of September 30, 2017, and December 31, 2016	4,655.6	4,522.2
General partner	91.5	88.8
Accumulated other comprehensive loss	(78.9)	(80.1)
Total partners’ capital	4,668.2	4,530.9
Total Liabilities and Partners' Capital	$ 8,762.1	$ 8,637.8