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OPERATING REVENUES - OTHER NON-UTILITY OPERATING REVENUES (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
We Power revenues |  |
Disaggregation of Operating Revenues |  |
Revenues amortized from deferred revenue during the period | $ 6.4 | $ 6.4
Revenues from contracts with customers |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 2,376.5 | 2,290.0
Other non-utility revenues | Revenues from contracts with customers |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 18.3 | 11.6
Other non-utility revenues | Revenues from contracts with customers | We Power revenues |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 6.4 | 6.4
Other non-utility revenues | Revenues from contracts with customers | Distributed renewable solar project revenues |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 1.5 | 1.3
Other non-utility revenues | Revenues from contracts with customers | Wind generation revenues |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 6.2 | 0.0
Other non-utility revenues | Revenues from contracts with customers | Other |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | 0.1 | 0.0
Transferred over time | Other non-utility revenues | Revenues from contracts with customers | Appliance service repairs |  |
Disaggregation of Operating Revenues |  |
Revenues from contracts with customers | $ 4.1 | $ 3.9
Upstream |  |
Disaggregation of Operating Revenues |  |
WEC's ownership interest in Upstream Wind Energy Center | 80.00% |
Number of years Upstream will receive fixed payment | 10 years |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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