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GOODWILL (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2018 USD ($)
Changes to our goodwill balances by segment |  |
Goodwill balance as of January 1, 2018 |  | $ 3,053.5
Goodwill balance as of September 30, 2018 | $ 3,052.8 | 3,052.8
Accumulated impairment losses | 0.0 | 0.0
Amount of impairment from goodwill test | 0.0 |
Bluewater |  |
Changes to our goodwill balances by segment |  |
Adjustment to Bluewater purchase price allocation |  | (0.7)
Wisconsin |  |
Changes to our goodwill balances by segment |  |
Goodwill balance as of January 1, 2018 |  | 2,104.3
Goodwill balance as of September 30, 2018 | 2,104.3 | 2,104.3
Wisconsin | Bluewater |  |
Changes to our goodwill balances by segment |  |
Adjustment to Bluewater purchase price allocation |  | 0.0
Illinois |  |
Changes to our goodwill balances by segment |  |
Goodwill balance as of January 1, 2018 |  | 758.7
Goodwill balance as of September 30, 2018 | 758.7 | 758.7
Illinois | Bluewater |  |
Changes to our goodwill balances by segment |  |
Adjustment to Bluewater purchase price allocation |  | 0.0
Other States |  |
Changes to our goodwill balances by segment |  |
Goodwill balance as of January 1, 2018 |  | 183.2
Goodwill balance as of September 30, 2018 | 183.2 | 183.2
Other States | Bluewater |  |
Changes to our goodwill balances by segment |  |
Adjustment to Bluewater purchase price allocation |  | 0.0
Non-Utility Energy Infrastructure |  |
Changes to our goodwill balances by segment |  |
Goodwill balance as of January 1, 2018 |  | 7.3
Goodwill balance as of September 30, 2018 | $ 6.6 | 6.6
Non-Utility Energy Infrastructure | Bluewater |  |
Changes to our goodwill balances by segment |  |
Adjustment to Bluewater purchase price allocation |  | $ (0.7)

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