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SEGMENT INFORMATION (Details) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2017 USD ($) segment | Mar. 31, 2016 USD ($)
Segment information |  |
Number of reportable segments | segment | 6 |
Revenues | $ 2,304.5 | $ 2,194.8
Other operation and maintenance | 501.9 | 531.5
Depreciation and amortization | 194.6 | 187.9
Operating income (loss) | 617.3 | 589.3
Equity in earnings of transmission affiliate | 41.9 | 38.5
Interest expense | 104.7 | 100.9
Intersegment revenues |  |
Segment information |  |
Revenues | 0.0 | 0.0
We Power |  |
Segment information |  |
Revenues | 6.3 | 6.2
Other operation and maintenance | 0.4 | 0.4
Depreciation and amortization | 17.5 | 17.0
Operating income (loss) | 97.4 | 93.3
Equity in earnings of transmission affiliate | 0.0 | 0.0
Interest expense | 15.3 | 15.6
We Power | Intersegment revenues |  |
Segment information |  |
Revenues | 109.0 | 104.5
Corporate and Other |  |
Segment information |  |
Revenues | 2.9 | 11.9
Other operation and maintenance | (1.6) | (3.5)
Depreciation and amortization | 5.6 | 10.1
Operating income (loss) | (1.2) | (0.3)
Equity in earnings of transmission affiliate | 0.0 | 0.0
Interest expense | 29.1 | 31.3
Corporate and Other | Intersegment revenues |  |
Segment information |  |
Revenues | 0.0 | 0.0
Reconciling Eliminations |  |
Segment information |  |
Revenues | 0.0 | 0.0
Other operation and maintenance | (109.0) | (104.6)
Depreciation and amortization | 0.0 | 0.0
Operating income (loss) | 0.0 | 0.0
Equity in earnings of transmission affiliate | 0.0 | 0.0
Interest expense | (1.8) | (2.7)
Reconciling Eliminations | Intersegment revenues |  |
Segment information |  |
Revenues | (109.0) | (104.6)
Regulated operations |  |
Segment information |  |
Revenues | 2,295.3 | 2,176.7
Other operation and maintenance | 612.1 | 639.2
Depreciation and amortization | 171.5 | 160.8
Operating income (loss) | 521.1 | 496.3
Equity in earnings of transmission affiliate | 41.9 | 38.5
Interest expense | 62.1 | 56.7
Regulated operations | Intersegment revenues |  |
Segment information |  |
Revenues | 0.0 | 0.1
Regulated operations | Wisconsin |  |
Segment information |  |
Revenues | 1,612.1 | 1,579.8
Other operation and maintenance | 462.9 | 491.3
Depreciation and amortization | 129.3 | 122.9
Operating income (loss) | 332.3 | 327.5
Equity in earnings of transmission affiliate | 0.0 | 0.0
Interest expense | 48.7 | 44.5
Regulated operations | Wisconsin | Intersegment revenues |  |
Segment information |  |
Revenues | 0.0 | 0.1
Regulated operations | Illinois |  |
Segment information |  |
Revenues | 525.3 | 448.5
Other operation and maintenance | 120.9 | 117.9
Depreciation and amortization | 36.2 | 32.8
Operating income (loss) | 155.4 | 137.0
Equity in earnings of transmission affiliate | 0.0 | 0.0
Interest expense | 11.1 | 9.7
Regulated operations | Illinois | Intersegment revenues |  |
Segment information |  |
Revenues | 0.0 | 0.0
Regulated operations | Other States |  |
Segment information |  |
Revenues | 157.9 | 148.4
Other operation and maintenance | 28.3 | 30.0
Depreciation and amortization | 6.0 | 5.1
Operating income (loss) | 33.4 | 31.8
Equity in earnings of transmission affiliate | 0.0 | 0.0
Interest expense | 2.3 | 2.5
Regulated operations | Other States | Intersegment revenues |  |
Segment information |  |
Revenues | 0.0 | 0.0
Regulated operations | Electric Transmission |  |
Segment information |  |
Revenues | 0.0 | 0.0
Other operation and maintenance | 0.0 | 0.0
Depreciation and amortization | 0.0 | 0.0
Operating income (loss) | 0.0 | 0.0
Equity in earnings of transmission affiliate | 41.9 | 38.5
Interest expense | 0.0 | 0.0
Regulated operations | Electric Transmission | Intersegment revenues |  |
Segment information |  |
Revenues | $ 0.0 | 0.0
ATC |  |
Segment information |  |
Equity method investment, ownership interest (as a percent) | 60.00% |
Equity in earnings of transmission affiliate | $ 41.9 | $ 38.5

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