CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 26.7	$ 1.3
Accounts receivable, net	63.4	59.2
Accrued unbilled revenues	42.5	53.1
Inventories	13.4	16.0
Regulatory assets	45.9	71.9
Prepaid taxes	23.2	23.0
Prepayments and other	4.9	4.6
Total current assets	220.0	229.1
Property, Plant and Equipment, Net [Abstract]
Property, plant and equipment, net	2,416.8	2,359.4
Other assets
Regulatory assets	218.0	224.4
Other	3.5	3.1
Total other assets	221.5	227.5
Total assets	2,858.3	2,816.0
Current liabilities
Short-term debt	0.0	65.0
Accounts payable	37.1	53.6
Accounts payable to affiliates	21.4	19.0
Dividends payable to parent	20.2	14.7
Regulatory liabilities	63.9	78.9
Taxes Accrued	7.7	6.8
Environmental liabilities	4.5	5.7
Accrued interest	9.5	9.3
Other	15.9	20.7
Total current liabilities	180.2	273.7
Deferred credits and other liabilities
Deferred income taxes	302.9	298.1
Deferred investment tax credits	6.2	6.5
Regulatory liabilities	360.6	370.8
Environmental liabilities	17.0	17.8
Customer advances	19.5	18.5
Pension and employee benefit obligations	26.6	33.4
Other	23.8	22.6
Total deferred credits and other liabilities	756.6	767.7
Capitalization
Long-term debt	906.0	808.0
Common stock — 1,000,000 shares authorized of $100 par value; 933,000 shares outstanding at June 30, 2020 and Dec. 31, 2019, respectively	$ 93.3	$ 93.3
Common stock, shares authorized (in shares)	1,000,000	1,000,000
Common stock, par value (in dollars per share)	$ 100	$ 100
Common stock, shares outstanding (in shares)	933,000	933,000
Additional paid in capital	$ 577.7	$ 537.3
Retained earnings	344.5	336.0
Total common stockholder’s equity	1,015.5	966.6
Total liabilities and equity	$ 2,858.3	$ 2,816.0