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OPERATING REVENUES - OTHER NON-UTILITY OPERATING REVENUES (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Disaggregation of Operating Revenues |  |  |  |
Revenues | $ 1,672.5 | $ 1,631.5 | $ 3,959.0 | $ 3,936.0
We Power revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues amortized from deferred revenue during the period | 6.2 |  | $ 12.6 |
Appliance service repairs | Maximum |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Duration of contract for remaining performance obligations in contract |  |  | 1 year |
Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 1,673.6 |  | $ 3,963.6 |
Other non-utility revenues | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 13.0 |  | 24.6 |
Other non-utility revenues | Revenues from contracts with customers | We Power revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 6.2 |  | 12.6 |
Other non-utility revenues | Revenues from contracts with customers | Distributed renewable solar project revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 2.8 |  | 4.1 |
Other non-utility revenues | Revenues from contracts with customers | Other |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | 0.1 |  | 0.1 |
Transferred over time | Other non-utility revenues | Revenues from contracts with customers | Appliance service repairs |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues | $ 3.9 |  | $ 7.8 |

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