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Revenue from Contracts with Customers (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Revenue from Contract with Customer, Excluding Assessed Tax | $ 2,175.5 | $ 2,211.7 | $ 0.0
Provision for Rate Refund [Member] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | (0.9) | (6.0) |
Integrated Market [Member] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 38.4 | 48.7 |
Transmission [Member] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 148.0 | 147.4 |
Other Contracts with Customers [Member] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 29.1 | 27.1 |
Residential [Member] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 865.8 | 877.8 |
Commercial [Member] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 486.6 | 500.0 |
Industrial [Member] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 217.8 | 228.9 |
Oilfield [Member] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 200.4 | 190.4 |
Public Authority [Member] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 190.3 | 197.4 |
Total Retail Customer [Member] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 1,960.9 | $ 1,994.5 |

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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 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: 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=118956577&loc=SL49130545-203045 + Details
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