XML 44 R31.htm IDEA: XBRL DOCUMENT
v3.5.0.2

Short-Term and Long-Term Debt Short-Term and Long-Term Debt (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2016
Debt Disclosure [Abstract] |
Schedule of Short-Term and Long-Term Debt [Table Text Block] | The following tables present ALLETE’s short-term and long-term debt as of June 30, 2016 and December 31, 2015.
June 30, 2016 | Principal |  |  | Unamortized Debt Issuance Costs |  | Total |
Millions |  |  |  |  |
Short-Term Debt (a) |  | $66.0 |  |  | $(0.6) |  |  | $65.4 |
Long-Term Debt | 1,510.1 |  |  | (11.2) |  | 1,498.9 |
Total Debt |  | $1,576.1 |  |  | $(11.8) |  |  | $1,564.3 |
(a) | Consisted of long-term debt due within one year and notes payable.
December 31, 2015 | Principal |  |  | Unamortized Debt Issuance Costs |  | Total |
Millions |  |  |  |  |
Short-Term Debt (a) |  | $37.9 |  |  | $(0.6) |  |  | $37.3 |
Long-Term Debt | 1,568.7 |  |  | (12.0) |  | 1,556.7 |
Total Debt |  | $1,606.6 |  |  | $(12.6) |  |  | $1,594.0 |
(a) | Consisted of long-term debt due within one year and notes payable.

X
- References No definition available. + Details
Name: | us-gaap_DebtDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
Name: | us-gaap_ScheduleOfDebtTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration