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Business Segments (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
a
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2017
USD ($)
a
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Business Segments [Line Items]                              
Description of Effect on Previously Reported Segment Information for Change in Composition of Reportable Segments                         We present three reportable segments: Regulated Operations, ALLETE Clean Energy, and U.S. Water Services. We measure performance of our operations through budgeting and monitoring of contributions to consolidated net income by each business segment.    
Number of Reportable Segments                         3    
Total Operating Revenue $ 337.9 $ 362.5 $ 353.3 $ 365.6 $ 341.5 $ 349.6 $ 314.8 $ 333.8 $ 380.6 $ 462.5 $ 323.3 $ 320.0 $ 1,419.3 $ 1,339.7 $ 1,486.4
Net Income Attributable to ALLETE 41.4 $ 44.9 $ 36.9 $ 49.0 44.3 $ 40.3 $ 24.8 $ 45.9 $ 18.3 $ 60.4 $ 22.5 $ 39.9 172.2 155.3 141.1
Depreciation and Amortization                         177.5 195.8 170.0
Operating Expenses – Other                         (0.7) (10.3) (36.3)
Interest Expense                         67.8 70.3 64.9
Equity Earnings in ATC                         22.5 18.5 16.3
Deferred Income Tax Expense (Benefit) due to the Remeasurement of Deferred Income Taxes [1]                         (13.0) 0.0 0.0
Income Tax Expense (Benefit)                         14.7 19.8 25.3
Assets [2] 5,080.0       4,876.9               5,080.0 4,876.9  
Capital Expenditures                         $ 266.5 247.8  
Regulated Operations [Member]                              
Business Segments [Line Items]                              
Number of Operating Segments                         3    
Total Operating Revenue                         $ 1,063.8 1,000.7 991.2
Net Income Attributable to ALLETE [3],[4]                         128.4 135.5 131.6
Depreciation and Amortization                         132.6 154.3 135.1
Interest Expense [3]                         57.0 52.1 53.9
Equity Earnings in ATC                         22.5 18.5 16.3
Deferred Income Tax Expense (Benefit) due to the Remeasurement of Deferred Income Taxes                         0.0    
Income Tax Expense (Benefit) [5],[6]                         27.2 5.9 24.4
Assets [2] 3,886.6       3,823.9               3,886.6 3,823.9  
Capital Expenditures                         177.1 121.8  
ALLETE Clean Energy [Member]                              
Business Segments [Line Items]                              
Total Operating Revenue [7]                         80.5 80.5 262.1
Net Income Attributable to ALLETE [3],[4]                         41.5 13.4 29.9
Depreciation and Amortization                         23.4 22.3 18.7
Operating Expenses – Other [8]                         0.0 3.3 0.0
Interest Expense [3]                         4.2 5.8 3.3
Deferred Income Tax Expense (Benefit) due to the Remeasurement of Deferred Income Taxes                         (23.6)    
Income Tax Expense (Benefit) [6]                         (14.2) 8.1 21.0
Assets 600.5       566.0               600.5 566.0  
Capital Expenditures                         56.1 106.9  
ALLETE Clean Energy [Member] | Wind Construction Project [Member]                              
Business Segments [Line Items]                              
Total Operating Revenue                             197.7
U.S. Water Services [Member]                              
Business Segments [Line Items]                              
Total Operating Revenue                         151.8 137.5 119.8
Net Income Attributable to ALLETE [3],[4]                         10.7 1.5 0.9
Depreciation and Amortization                         9.8 8.9 7.3
Interest Expense [3]                         1.6 1.7 1.4
Deferred Income Tax Expense (Benefit) due to the Remeasurement of Deferred Income Taxes                         (9.2)    
Income Tax Expense (Benefit) [6]                         (7.8) 1.4 0.9
Assets $ 292.4       264.1               292.4 264.1  
Capital Expenditures                         $ 4.4 3.7  
Corporate and Other [Member]                              
Business Segments [Line Items]                              
Number of Operating Segments                         2    
Land in Minnesota (Acres) | a 5,000                       5,000    
Total Operating Revenue                         $ 123.2 121.0 113.3
Net Income Attributable to ALLETE [3],[4]                         (8.4) 4.9 (21.3)
Depreciation and Amortization                         11.7 10.3 8.9
Operating Expenses – Other                         (0.7) [8] (13.6) [3] 36.3 [8]
Interest Expense [3]                         10.3 14.5 8.6
Deferred Income Tax Expense (Benefit) due to the Remeasurement of Deferred Income Taxes                         19.8    
Income Tax Expense (Benefit) [5],[6]                         9.5 4.4 (21.0)
Assets $ 300.5       $ 222.9               300.5 222.9  
Capital Expenditures                         28.9 15.4  
Eliminations [Member]                              
Business Segments [Line Items]                              
Interest Expense [3]                         (5.3) (3.8) $ (2.3)
Income Tax Expense [Member] | Regulated Operations [Member]                              
Business Segments [Line Items]                              
Net Income Attributable to ALLETE                         0.0    
Renewable Cost Recovery Rider [Member] | MPUC [Member] | Income Tax Expense [Member] | Regulated Operations [Member]                              
Business Segments [Line Items]                              
Income Tax Expense (Benefit)                         14.0 (15.0)  
Renewable Cost Recovery Rider [Member] | MPUC [Member] | Income Tax Expense [Member] | Corporate and Other [Member]                              
Business Segments [Line Items]                              
Income Tax Expense (Benefit)                         $ (7.9) $ 8.8  
[1] Deferred income tax benefit from the remeasurement of deferred income tax assets and liabilities resulting from the TCJA. (See Note 1. Operations and Significant Accounting Policies.)
[2] See Note 1. Operations and Significant Accounting Policies – Revision of Prior Balance Sheet.
[3] Includes interest expense resulting from intercompany loan agreements and allocated to certain subsidiaries. The amounts are eliminated in consolidation.
[4] Net income in 2017 included a favorable impact of $13.0 million after-tax due to the remeasurement of deferred income tax assets and liabilities resulting from the TCJA, which consisted of a $23.6 million after-tax benefit for ALLETE Clean Energy, a $9.2 million after-tax benefit for U.S. Water Services and a $19.8 million after-tax expense for Corporate and Other. The TCJA did not have an impact on net income for our Regulated Operations as the remeasurement of deferred income tax assets and liabilities primarily resulted in the recording of regulatory assets and liabilities. (See Note 1. Operations and Significant Accounting Policies, and Note 4. Regulatory Matters.)
[5] In 2017, Regulated Operations includes $14.0 million of income tax expense related to North Dakota investment tax credits transferred to Corporate and Other and higher pre-tax income for the favorable impact for the regulatory outcome of the MPUC’s modification of its November 2016 order on the allocation of North Dakota investment tax credits. There was no impact to net income for Regulated Operations. Corporate and Other recorded an offsetting income tax benefit of $7.9 million in 2017. In 2016, Regulated Operations includes $15.0 million of income tax benefit for North Dakota investment tax credits transferred from Corporate and Other and lower pre-tax income related to the adverse impact for the regulatory outcome of the November 2016 MPUC order. There was no impact to net income for Regulated Operations. Corporate and Other recorded an offsetting income tax expense of $8.8 million in 2016. (See Note 4. Regulatory Matters.)
[6] Income tax expense in 2017 included an income tax benefit of $13.0 million due to the remeasurement of deferred income tax assets and liabilities resulting from the TCJA, which consisted of income tax benefits of $23.6 million for ALLETE Clean Energy and $9.2 million for U.S. Water Services as well as additional income tax expense of $19.8 million for Corporate and Other. The TCJA did not have an impact on income tax expense for our Regulated Operations as the remeasurement of deferred income tax assets and liabilities primarily resulted in the recording of regulatory assets and liabilities. (See Note 1. Operations and Significant Accounting Policies, and Note 4. Regulatory Matters.)
[7] Includes the construction and sale of a wind energy facility by ALLETE Clean Energy to Montana-Dakota Utilities for $197.7 million in 2015.
[8] See Note 1. Operations and Significant Accounting Policies.