Balance Sheets - USD ($) $ in Millions		Dec. 31, 2017	Dec. 31, 2016
Current Assets
Cash and cash equivalents		$ 6.7	$ 7.6
Customer receivables (less allowance for doubtful accounts of $1.7 at both dates)		171.7	162.2
Other receivables		2.1	1.5
Affiliated receivables		1.5	0.6
Inventories at lower of average cost or market:
Gas stored		52.9	49.3
Materials and supplies		25.2	27.6
Regulatory assets		16.6	9.6
Prepayments		3.9	3.5
Other		1.4	0.2
Total current assets		282.0	262.1
Property, Plant and Equipment
Property, plant and equipment		3,041.7	2,883.0
Accumulated depreciation and amortization		(745.8)	(737.6)
Total property, plant and equipment, net		2,295.9	2,145.4
Deferred Charges and Other Assets
Pension and other postretirement benefit assets	[1]	107.1	87.8
Goodwill	[2]	5.6	5.6
Other		7.2	5.6
Total deferred charges and other assets		119.9	99.0
Total assets		2,697.8	2,506.5
Current Liabilities
Securities due within one year		120.0	14.5
Short-term debt		165.0	200.0
Affiliated current borrowings		75.0	48.0
Accounts payable		53.8	72.5
Accrued interest, payroll and taxes		15.6	19.2
Payables to affiliates		68.3	43.5
Customer advances		17.3	27.9
Other		37.1	33.7
Total current liabilities		552.1	459.3
Long-Term Debt		595.9	616.3
Deferred Credits and Other Liabilities
Deferred income taxes		276.1	475.8
Regulatory liabilities		441.0	189.1
Asset retirement obligations		76.9	76.2
Customer contributions in aid of construction		12.2	19.0
Pension and other postretirement benefit liabilities	[1]	14.9	13.0
Other		3.6	0.2
Total deferred credits and other liabilities		824.7	773.3
Total liabilities		1,972.7	1,848.9
Commitments and Contingencies (see Note 17)
Equity
Common stock - par value $2.50	[3]	23.0	23.0
Other paid-in capital		272.5	272.5
Retained earnings		429.6	362.1
Total common shareholder's equity		725.1	657.6
Total liabilities and shareholder's equity		$ 2,697.8	$ 2,506.5

[1] See Note 19 for amounts attributable to related parties.

[2] There are no accumulated impairment losses

[3] 50.0 million shares authorized; 9.2 million shares outstanding at December 31, 2017 and December 31, 2016.