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GOODWILL (Details) $ in Millions | 1 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 USD ($) | Jun. 30, 2017 USD ($)
Changes to our goodwill balances by segment |  |
Goodwill balance as of January 1, 2017 |  | $ 3,046.2
Goodwill balance as of June 30, 2017 | $ 3,053.5 | 3,053.5
Accumulated impairment losses | 0.0 | 0.0
Bluewater |  |
Changes to our goodwill balances by segment |  |
Acquisition of Bluewater | 7.3 | 7.3
Wisconsin |  |
Changes to our goodwill balances by segment |  |
Goodwill balance as of January 1, 2017 |  | 2,104.3
Goodwill balance as of June 30, 2017 | 2,104.3 | 2,104.3
Wisconsin | Bluewater |  |
Changes to our goodwill balances by segment |  |
Acquisition of Bluewater |  | 0.0
Illinois |  |
Changes to our goodwill balances by segment |  |
Goodwill balance as of January 1, 2017 |  | 758.7
Goodwill balance as of June 30, 2017 | 758.7 | 758.7
Illinois | Bluewater |  |
Changes to our goodwill balances by segment |  |
Acquisition of Bluewater |  | 0.0
Other States |  |
Changes to our goodwill balances by segment |  |
Goodwill balance as of January 1, 2017 |  | 183.2
Goodwill balance as of June 30, 2017 | 183.2 | 183.2
Other States | Bluewater |  |
Changes to our goodwill balances by segment |  |
Acquisition of Bluewater |  | 0.0
Non-Utility Energy |  |
Changes to our goodwill balances by segment |  |
Goodwill balance as of January 1, 2017 |  | 0.0
Goodwill balance as of June 30, 2017 | $ 7.3 | 7.3
Non-Utility Energy | Bluewater |  |
Changes to our goodwill balances by segment |  |
Acquisition of Bluewater |  | $ 7.3

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