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OPERATING REVENUES - OTHER NON-UTILITY OPERATING REVENUES (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Disaggregation of Operating Revenues |  |
Revenues | $ 2,286.5 | $ 2,304.5
We Power revenues |  |
Disaggregation of Operating Revenues |  |
Revenue amortized from deferred revenue during the period | $ 6.4 |
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 | $ 2,290.0 |
Other non-utility revenues | Revenues from contracts with customers |  |
Disaggregation of Operating Revenues |  |
Revenues | 11.6 |
Other non-utility revenues | Revenues from contracts with customers | We Power revenues |  |
Disaggregation of Operating Revenues |  |
Revenues | 6.4 |
Other non-utility revenues | Revenues from contracts with customers | Distributed renewable solar project revenues |  |
Disaggregation of Operating Revenues |  |
Revenues | 1.3 |
Transferred over time | Other non-utility revenues | Revenues from contracts with customers | Appliance service repairs |  |
Disaggregation of Operating Revenues |  |
Revenues | $ 3.9 |

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