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Goodwill and Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Intangible Assets [Table Text Block] | alance 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.

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- Definition Tabular disclosure of goodwill and intangible assets, which may be broken down by segment or major class. + 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 + Details
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