CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Current Assets:
Cash and cash equivalents	$ 5.4	$ 6.6
Receivables:
Trade	91.0	102.6
Other	12.7	8.3
Gas transportation receivables	2.8	9.1
Gas and liquids stored underground	10.1	4.1
Prepayments	19.1	14.5
Other current assets	4.1	4.4
Total current assets	145.2	149.6
Property, Plant and Equipment:
Natural gas transmission and other plant	9,405.8	9,250.1
Construction work in progress	189.6	105.5
Property, plant and equipment, gross	9,595.4	9,355.6
Less—accumulated depreciation and amortization	1,998.7	1,766.4
Property, plant and equipment, net	7,596.7	7,589.2
Other Assets:
Goodwill	237.4	237.4
Gas stored underground	101.4	86.4
Other	149.2	144.2
Total other assets	488.0	468.0
Total Assets	8,229.9	8,206.8
Payables:
Trade, net	67.1	51.7
Affiliates	1.4	1.5
Other	19.4	10.4
Gas payables	7.6	8.5
Accrued taxes, other	68.0	47.1
Accrued interest	33.3	47.4
Accrued payroll and employee benefits	24.1	26.3
Deferred income	4.5	1.9
Other current liabilities	49.6	25.4
Total current liabilities	275.0	220.2
Long-term debt and capital lease obligation	3,459.2	3,689.7
Other Liabilities and Deferred Credits:
Pension liability	15.9	19.2
Asset retirement obligation	40.9	39.9
Provision for other asset retirement	63.2	60.5
Payable to affiliate	16.0	16.0
Other	64.1	59.0
Total other liabilities and deferred credits	$ 200.1	$ 194.6
Commitments and Contingencies
Partners’ Capital:
Common units – 250.3 million units and 243.3 million units issued and outstanding as of September 30, 2015, and December 31, 2014	$ 4,287.0	$ 4,095.1
General partner	83.9	80.0
Accumulated other comprehensive loss	(75.3)	(72.8)
Total partners’ capital	4,295.6	4,102.3
Total Liabilities and Partners' Capital	$ 8,229.9	$ 8,206.8