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Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of changes to goodwill balances by segment | The following table shows changes to our goodwill balances by segment during the years ended December 31, 2018 and 2017:
|  | Wisconsin |  | Illinois |  | Other States |  | Non-Utility Energy Infrastructure |  | Total
(in millions) |  | 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017
Goodwill balance as of January 1 |  | $ | 2,104.3 |  |  | $ | 2,104.3 |  |  | $ | 758.7 |  |  | $ | 758.7 |  |  | $ | 183.2 |  |  | $ | 183.2 |  |  | $ | 7.3 |  |  | $ | — |  |  | $ | 3,053.5 |  |  | $ | 3,046.2 |
Acquisition of Bluewater (1) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 7.3 |  |  | — |  |  | 7.3 |
Adjustment to Bluewater purchase price allocation (1) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (0.7 | ) |  | — |  |  | (0.7 | ) |  | — |
Goodwill balance as of December 31 (2) |  | $ | 2,104.3 |  |  | $ | 2,104.3 |  |  | $ | 758.7 |  |  | $ | 758.7 |  |  | $ | 183.2 |  |  | $ | 183.2 |  |  | $ | 6.6 |  |  | $ | 7.3 |  |  | $ | 3,052.8 |  |  | $ | 3,053.5 |
(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 December 31, 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267 + Details
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