CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 37.9	$ 84.5
Accounts receivable and unbilled revenues, net of reserves of $143.3 and $149.2, respectively	1,004.3	1,280.9
Materials, supplies, and inventories	461.4	548.2
Prepayments	254.8	256.8
Other	80.3	77.2
Current assets	1,838.7	2,247.6
Long-term assets
Property, plant, and equipment, net of accumulated depreciation and amortization of $8,705.0 and $8,636.6, respectively	22,535.8	22,000.9
Regulatory assets	4,007.0	3,805.1
Equity investment in transmission affiliates	1,696.5	1,665.3
Goodwill	3,052.8	3,052.8
Other	803.5	704.1
Long-term assets	32,095.6	31,228.2
Total assets	33,934.3	33,475.8
Current liabilities
Short-term debt	1,262.7	1,440.1
Current portion of long-term debt	766.5	365.0
Accounts payable	715.6	876.4
Accrued payroll and benefits	159.3	185.4
Other	457.9	464.8
Current liabilities	3,362.0	3,331.7
Long-term liabilities
Long-term debt	9,921.0	9,994.0
Deferred income taxes	3,598.1	3,388.1
Deferred revenue, net	508.7	520.4
Regulatory liabilities	4,243.6	4,251.6
Environmental remediation liabilities	631.8	616.4
Pension and OPEB obligations	414.0	422.8
Other	1,106.8	1,108.1
Long-term liabilities	20,424.0	20,301.4
Commitments and contingencies (Note 21)
Common shareholders' equity
Common stock – $0.01 par value; 325,000,000 shares authorized; 315,435,820 and 315,523,192 shares outstanding, respectively	3.2	3.2
Additional paid in capital	4,197.9	4,250.1
Retained earnings	5,821.7	5,538.2
Accumulated other comprehensive loss	(6.6)	(2.6)
Common shareholders' equity	10,016.2	9,788.9
Preferred stock of subsidiary	30.4	30.4
Noncontrolling interests	101.7	23.4
Total liabilities and equity	$ 33,934.3	$ 33,475.8