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GOODWILL (Tables) | 6 Months Ended
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Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of changes to our goodwill balances by segment | The following table shows changes to our goodwill balances by segment during the six months ended June 30, 2018:
(in millions) |  | Wisconsin |  | Illinois |  | Other States |  | Non-Utility Energy Infrastructure |  | Total
Goodwill balance as of January 1, 2018 |  | $ | 2,104.3 |  |  | $ | 758.7 |  |  | $ | 183.2 |  |  | $ | 7.3 |  |  | $ | 3,053.5 |
Adjustment to Bluewater purchase price allocation (1) |  | — |  |  | — |  |  | — |  |  | (0.7 | ) |  | (0.7 | )
Goodwill balance as of June 30, 2018 (2) |  | $ | 2,104.3 |  |  | $ | 758.7 |  |  | $ | 183.2 |  |  | $ | 6.6 |  |  | $ | 3,052.8 |
(1) | See Note 2, Acquisitions, for more information on the acquisition of Bluewater.
(2) | We had no accumulated impairment losses related to our goodwill as of June 30, 2018.

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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