Balance Sheets - USD ($) $ in Millions		Dec. 31, 2016	Dec. 31, 2015
Current Assets
Cash and cash equivalents		$ 7.6	$ 10.5
Customer receivables (less allowance for doubtful accounts of $1.7 at both dates)		163.7	168.8
Receivable from affiliates		0.6	103.4
Inventories at lower of average cost or market:
Gas stored underground		49.3	43.9
Materials and supplies		27.6	17.1
Regulatory assets		9.6	69.8
Prepaid expenses and other		3.7	3.5
Total current assets		262.1	417.0
Property, Plant and Equipment
Property, plant and equipment		2,883.0	2,570.3
Accumulated depreciation and amortization		(737.6)	(812.2)
Total property, plant and equipment, net		2,145.4	1,758.1
Receivable from affiliates		98.3	0.0
Goodwill	[1]	5.6	5.6
Regulatory assets		5.5	11.9
Other noncurrent assets		0.1	0.1
Total deferred charges and other assets		109.5	17.6
Total assets		2,517.0	2,192.7
Current Liabilities
Securities due within one year		14.5	0.0
Short-term debt		200.0	0.0
Affiliated current borrowings		48.0	273.3
Accounts payable and accrued expenses		117.2	122.5
Accounts payable to affiliates		43.5	74.5
Customer advances		27.9	34.3
Other current liabilities		8.2	4.0
Total current liabilities		459.3	508.6
Long-Term Debt		616.3	531.2
Deferred Credits and Other Liabilities
Deferred income taxes		475.8	436.7
Regulatory liabilities		189.1	65.6
Asset retirement obligations		76.2	0.6
Payables to affiliates		23.5	0.0
Customer contributions in aid of construction		19.0	23.7
Other noncurrent liabilities		0.2	1.6
Total deferred credits and other liabilities		783.8	528.2
Total liabilities		1,859.4	1,568.0
Commitments and Contingencies (see Note 16)
Common Shareholder's Equity
Common stock - par value $2.50; 50.0 million shares authorized; 9.2 million shares issued and outstanding at December 31, 2016 and December 31, 2015		23.0	23.0
Additional paid-in capital		272.5	266.8
Retained earnings		362.1	334.9
Total common shareholder's equity		657.6	624.7
Total liabilities and shareholder's equity		$ 2,517.0	$ 2,192.7

[1] There are no accumulated impairment losses.