CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions		Dec. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents		$ 33.4	$ 7.5
Accounts receivable, net		310.3	294.4
Accounts receivable from affiliates		80.8	14.7
Investments Receivable in Utility Money Pool Arrangement		0.0	20.0
Accrued unbilled revenues		313.5	295.8
Public Utilities, Inventory		197.4	214.5
Regulatory assets		120.6	77.3
Derivative instruments		42.6	3.2
Prepayments and other		23.8	35.7
Total current assets		1,122.4	963.1
Property, plant and equipment, net		15,120.0	14,025.8
Other assets
Regulatory assets		1,010.7	950.3
Derivative instruments		1.2	1.0
Other		37.2	27.4
Total other assets		1,049.1	978.7
Total assets		17,291.5	15,967.6
Current liabilities
Current portion of long-term debt		406.2	305.6
Short-term debt		307.0	0.0
Accounts payable		503.4	492.9
Accounts payable to affiliates		46.0	58.7
Regulatory liabilities	[1]	67.3	66.1
Taxes accrued		202.0	222.5
Accrued interest		43.2	48.6
Dividends payable to parent		91.5	76.2
Derivative instruments		34.6	7.3
Other		101.5	92.3
Total current liabilities		1,802.7	1,370.2
Deferred credits and other liabilities
Deferred income taxes		1,719.3	1,644.5
Deferred investment tax credits		25.3	27.8
Regulatory liabilities	[1]	2,021.5	1,933.5
Asset retirement obligations		338.7	347.8
Derivative instruments		0.6	3.5
Customer advances		168.1	162.6
Pension and employee benefit obligations		275.3	287.8
Other		50.4	58.9
Total deferred credits and other liabilities		4,599.2	4,466.4
Capitalization
Long-term debt		4,591.4	4,302.7
Common stock — 100 shares authorized of $0.01 par value; 100 shares outstanding at Dec. 31, 2018 and 2017, respectively		0.0	0.0
Additional paid in capital		4,340.5	4,032.8
Retained earnings		1,983.2	1,822.2
Accumulated other comprehensive loss		(25.5)	(26.7)
Total common stockholder’s equity		6,298.2	5,828.3
Total liabilities and equity		$ 17,291.5	$ 15,967.6

[1] Revenue subject to refund of $16.2 million and $0.0 million for 2018 and 2017, respectively, is included in other current liabilities.