CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 35.0	$ 24.8
Accounts receivable and unbilled revenues, net of reserves of $231.7 and $220.1, respectively	1,182.7	1,202.8
Materials, supplies, and inventories	452.7	528.6
Prepayments	283.7	263.4
Amounts recoverable from customers	213.6	20.0
Other	110.4	43.4
Current assets	2,278.1	2,083.0
Long-term assets
Property, plant, and equipment, net of accumulated depreciation and amortization of $9,625.3 and $9,364.7, respectively	26,266.4	25,707.4
Regulatory assets (June 30, 2021 includes $106.0 related to WEPCo Environmental Trust)	3,409.9	3,524.1
Equity investment in transmission affiliates	1,782.0	1,764.3
Goodwill	3,052.8	3,052.8
Other	1,005.7	896.5
Long-term assets	35,516.8	34,945.1
Total assets	37,794.9	37,028.1
Current liabilities
Short-term debt	1,424.5	1,776.9
Current portion of long-term debt (June 30, 2021 includes $4.1 related to WEPCo Environmental Trust)	493.6	785.8
Accounts payable	744.6	880.7
Other	711.2	704.7
Current liabilities	3,373.9	4,148.1
Long-term liabilities
Long-term debt (June 30, 2021 includes $111.1 related to WEPCo Environmental Trust)	12,695.7	11,728.1
Deferred income taxes	4,269.6	4,059.8
Deferred revenue, net	400.7	412.2
Regulatory liabilities	3,935.5	3,928.1
Environmental remediation liabilities	518.2	532.9
Pension and OPEB obligations	314.2	327.0
Other	1,256.7	1,229.4
Long-term liabilities	23,390.6	22,217.5
Commitments and contingencies (Note 20)
Common shareholders' equity
Common stock – $0.01 par value; 325,000,000 shares authorized; 315,434,531 shares outstanding	3.2	3.2
Additional paid in capital	4,144.1	4,143.7
Retained earnings	6,688.2	6,329.6
Accumulated other comprehensive loss	(4.6)	(6.8)
Common shareholders' equity	10,830.9	10,469.7
Preferred stock of subsidiary	30.4	30.4
Noncontrolling interests	169.1	162.4
Total liabilities and equity	37,794.9	37,028.1
Regulatory Assets	3,623.5	3,544.1
Securitization
Common shareholders' equity
Regulatory Assets	$ 106.0	$ 105.2

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

Name:	us-gaap_AccountsPayableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6676-107765

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4531-111522