XML 43 R29.htm IDEA: XBRL DOCUMENT
v3.2.0.727

Goodwill and Intangible Assets (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2015
Goodwill and Intangible Assets [Abstract] |
Schedule of Goodwill [Table Text Block] | The following table summarizes changes to goodwill by business segment for the six months ended June 30, 2015:
| Investments and Other |
Millions |
Balance as of December 31, 2014 |  | $2.9 |
Acquired Goodwill | 127.2 |
Balance as of June 30, 2015 |  | $130.1 |
Schedule of Intangible Assets [Table Text Block] | Balances of intangible assets, net, excluding goodwill as of June 30, 2015, are as follows:
| December 31, 2014 |  |  | Additions as a Result of Acquisitions |  | Amortization |  | June 30, 2015 |
Millions |  |  |  |  |  |  |
Intangible Assets |  |  |  |  |  |  |
Definite-Lived Intangible Assets |  |  |  |  |  |  |
Customer Relationships | — |  |  |  | $60.1 |  |  |  | $1.3 |  |  |  | $58.8 |
Developed Technology and Other (a) |  | $1.9 |  |  | 6.3 |  |  | 0.3 |  |  | 7.9 |
Total Definite-Lived Intangible Assets | 1.9 |  |  | 66.4 |  |  | 1.6 |  |  | 66.7 |
Indefinite-Lived Intangible Assets |  |  |  |  |  |  |
Trademarks and Trade Names | — |  |  | 16.6 |  |  | n/a |  |  | 16.6 |
Total Intangible Assets |  | $1.9 |  |  |  | $83.0 |  |  |  | $1.6 |  |  |  | $83.3 |
(a) | Developed Technology and Other includes patents, non-compete agreements, and land easements.

X
- Definition Goodwill and Intangible Assets [Abstract] + References No definition available. + Details
Name: | ale_GoodwillandIntangibleAssetsAbstract
Namespace Prefix: | ale_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure or assets, excluding financial assets and goodwill, lacking physical substance, by either major class or business segment. + References No definition available. + Details
Name: | ale_ScheduleofIntangibleAssetsTableTextBlock
Namespace Prefix: | ale_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_ScheduleOfGoodwillTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration