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Goodwill and Intangible Assets | 3 Months Ended
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Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets [Text Block] | GOODWILL AND INTANGIBLE ASSETS As a result of completing the sale of U.S. Water Services on March 26, 2019, there was no goodwill recorded as of March 31, 2019 ($148.5 million at December 31, 2018). The balance of intangible assets, net, as of March 31, 2019, is as follows:
| December 31, 2018 |  |  | Amortization |  | Other (b) |  | March 31, 2019 |
Millions |  |  |  |  |  |  |
Intangible Assets |  |  |  |  |  |  |
Definite-Lived Intangible Assets |  |  |  |  |  |  |
Customer Relationships |  | $50.7 |  |  | $(1.1) |  | $(49.6) |  | — |
Developed Technology and Other (a) | 7.5 |  |  | (0.3) |  | (6.1) |  |  | $1.1 |
Total Definite-Lived Intangible Assets | 58.2 |  |  | (1.4) |  | (55.7) |  | 1.1 |
Indefinite-Lived Intangible Assets |  |  |  |  |  |  |
Trademarks and Trade Names | 16.6 |  |  | n/a |  | (16.6) |  | — |
Total Intangible Assets |  | $74.8 |  |  | $(1.4) |  | $(72.3) |  |  | $1.1 |
(a) | Developed Technology and Other includes patents, non-compete agreements, land easements and trade names with finite lives.
(b) | On March 26, 2019, ALLETE completed the sale of U.S. Water Services which resulted in the removal of the related intangible assets from the Consolidated Balance Sheet.
Amortization expense for intangible assets was $1.4 million for the three months ended March 31, 2019, and 2018. The remaining definite-lived intangible assets will continue to be amortized ratably through 2028.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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