CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 1.8	$ 1.3
Accounts receivable, net	64.0	59.2
Accrued unbilled revenues	42.3	53.1
Inventories	12.2	16.0
Regulatory assets	55.7	71.9
Prepaid taxes	17.7	23.0
Prepayments and other	5.1	4.6
Total current assets	198.8	229.1
Property, Plant and Equipment, Net [Abstract]
Property, plant and equipment, net	2,382.7	2,359.4
Other assets
Regulatory assets	220.8	224.4
Other	3.0	3.1
Total other assets	223.8	227.5
Total assets	2,805.3	2,816.0
Current liabilities
Short-term debt	76.0	65.0
Accounts payable	33.3	53.6
Accounts payable to affiliates	13.2	19.0
Dividends payable to parent	16.8	14.7
Regulatory liabilities	67.3	78.9
Taxes Accrued	11.3	6.8
Environmental liabilities	5.1	5.7
Accrued interest	7.8	9.3
Other	13.9	20.7
Total current liabilities	244.7	273.7
Deferred credits and other liabilities
Deferred income taxes	301.3	298.1
Deferred investment tax credits	6.3	6.5
Regulatory liabilities	366.0	370.8
Environmental liabilities	18.0	17.8
Customer advances	18.4	18.5
Pension and employee benefit obligations	26.6	33.4
Other	22.6	22.6
Total deferred credits and other liabilities	759.2	767.7
Capitalization
Long-term debt	808.2	808.0
Common stock — 1,000,000 shares authorized of $100 par value; 933,000 shares outstanding at March 31, 2020 and Dec. 31, 2019, respectively	93.3	93.3
Additional paid in capital	547.3	537.3
Retained earnings	352.6	336.0
Total common stockholder’s equity	993.2	966.6
Total liabilities and equity	$ 2,805.3	$ 2,816.0