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Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2016
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, 2016 and 2015:
|  | Wisconsin |  | Illinois |  | Other States |  | Total
(in millions) |  | 2016 |  | 2015 |  | 2016 |  | 2015 |  | 2016 |  | 2015 |  | 2016 |  | 2015
Goodwill balance as of January 1 |  | $ | 2,109.5 |  |  | $ | 441.9 |  |  | $ | 731.2 |  |  | $ | — |  |  | $ | 182.8 |  |  | $ | — |  |  | $ | 3,023.5 |  |  | $ | 441.9 |
Adjustment to Integrys purchase price allocation |  | (5.2 | ) |  | — |  |  | 27.5 |  |  | — |  |  | 0.4 |  |  | — |  |  | 22.7 |  |  | — |
Acquisition of Integrys |  | — |  |  | 1,667.6 |  |  | — |  |  | 731.2 |  |  | — |  |  | 182.8 |  |  | — |  |  | 2,581.6 |
Goodwill balance as of December 31 * |  | $ | 2,104.3 |  |  | $ | 2,109.5 |  |  | $ | 758.7 |  |  | $ | 731.2 |  |  | $ | 183.2 |  |  | $ | 182.8 |  |  | $ | 3,046.2 |  |  | $ | 3,023.5 |
* | We had no accumulated impairment losses related to our goodwill as of December 31, 2016.

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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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