CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents at beginning of period	$ 16.6	$ 11.4
Accounts receivable, net	324.9	303.9
Accounts receivable from affiliates	0.0	52.7
Accrued unbilled revenues	220.9	293.9
Total inventories	177.0	192.0
Regulatory assets	96.0	64.0
Derivative instruments	19.0	7.2
Prepayments and other	77.2	55.9
Total current assets	931.6	981.0
Property, plant and equipment, net	17,204.5	16,155.0
Other assets
Regulatory assets	1,053.4	1,038.1
Derivative instruments	3.1	0.0
Operating lease right-of-use assets	520.5	574.0
Other	250.9	259.4
Total other assets	1,827.9	1,871.5
Total assets	19,964.0	19,007.5
Current liabilities
Current portion of long-term debt	0.0	400.0
Borrowings under utility money pool arrangement	61.0	39.0
Accounts payable	414.8	573.3
Accounts payable to affiliates	60.3	43.9
Regulatory liabilities	75.0	69.2
Taxes accrued	186.1	202.1
Accrued interest	35.8	53.4
Dividends payable to parent	102.9	111.5
Derivative instruments	20.8	8.7
Operating lease liabilities	92.1	85.8
Other	88.8	98.8
Total current liabilities	1,137.6	1,685.7
Deferred credits and other liabilities
Deferred income taxes	1,911.0	1,850.8
Deferred investment tax credits	21.0	22.8
Regulatory liabilities	2,316.9	2,036.8
Asset retirement obligations	359.2	324.0
Derivative instruments	42.5	52.5
Customer advances	170.1	173.6
Pension and employee benefit obligations	165.9	211.9
Operating lease liabilities	457.2	517.6
Other	149.2	150.9
Total deferred credits and other liabilities	5,593.0	5,340.9
Commitments and contingencies
Capitalization
Long-term debt	$ 5,722.7	$ 4,984.7
Common Stock, Shares Authorized	100	100
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares, Outstanding	100	100
Common stock — 100 shares authorized of $0.01 par value; 100 shares outstanding at Sept. 30, 2020 and Dec. 31, 2019, respectively	$ 0.0	$ 0.0
Additional paid in capital	5,693.4	4,939.4
Retained earnings	1,843.0	2,083.4
Accumulated other comprehensive loss	(25.7)	(26.6)
Total common stockholder's equity	7,510.7	6,996.2
Total liabilities and stockholder's equity	$ 19,964.0	$ 19,007.5