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Revenue from Contracts with Customers (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from contracts with customers | [1] | $ 848.2 | $ 687.8 | $ 3,033.7 | $ 1,600.2
Residential |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from contracts with customers |  | 365.5 | 294.9 | 1,112.2 | 664.6
Commercial |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from contracts with customers |  | 203.4 | 156.7 | 619.2 | 361.0
Industrial |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from contracts with customers |  | 79.9 | 59.3 | 264.1 | 145.5
Oilfield |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from contracts with customers |  | 68.0 | 50.6 | 257.5 | 127.2
Public authorities and street light |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from contracts with customers |  | 75.0 | 57.8 | 235.1 | 133.1
System sales revenues |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from contracts with customers |  | 791.8 | 619.3 | 2,488.1 | 1,431.4
Provision for rate refund |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from contracts with customers |  | 0.0 | 4.8 | 0.0 | 3.2
Integrated market |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from contracts with customers |  | 17.2 | 18.0 | 447.6 | 33.7
Transmission |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from contracts with customers |  | 30.8 | 35.0 | 103.8 | 109.0
Other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from contracts with customers |  | $ 8.4 | $ 10.7 | $ (5.8) | $ 22.9
[1] | In February 2021, Winter Storm Uri resulted in record winter peak demand for electricity and extremely high natural gas and purchased power prices in OG&E's service territory. Operating revenues for the nine months ended September 30, 2021 significantly increased due to increased fuel, purchased power and direct transmission expenses, which are generally recoverable from customers, as a result of Winter Storm Uri. For further discussion, see Note 15 and "Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operation."

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9031-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9038-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130543-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130545-203045 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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