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2414404 - Disclosure - Income Tax Expense - Deferred Tax Assets and Liabilities (Details)
(http://www.allete.com/role/IncomeTaxExpenseDeferredTaxAssetsAndLiabilitiesDetails)
Table(Implied)
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000066756 (http://www.sec.gov/CIK)
Income Tax Disclosure [Abstract]Period [Axis]
2016-12-31
2015-12-31
Income Tax Disclosure [Abstract]
 
 
Deferred Tax Assets and Liabilities [Abstract]
 
 
Deferred Tax Assets [Abstract]
 
 
Employee Benefits and Compensation
104,600,000  
105,400,000  
Property Related
117,800,000  
126,600,000  
NOL Carryforwards
185,600,000  
186,400,000  
Tax Credit Carryforwards
227,400,000  
164,800,000  
Power Sales Agreements
59,300,000  
73,000,000  
Other
46,900,000  
21,800,000  
Gross Deferred Tax Assets
741,600,000  
 
678,000,000  
 
Deferred Tax Asset Valuation Allowance
(43,000,000) 
(31,600,000) 
Total Deferred Tax Assets
698,600,000  
 
646,400,000  
 
Deferred Tax Liabilities [Abstract]
 
 
Property Related
1,094,700,000  
1,053,000,000  
Regulatory Asset for Benefit Obligations
91,900,000  
89,400,000  
Unamortized Investment Tax Credits
33,300,000  
26,000,000  
Partnership Basis Differences
50,900,000  
47,800,000  
Other
11,900,000  
10,000,000  
Total Deferred Tax Liabilities
1,282,700,000  
 
1,226,200,000  
 
Net Deferred Income Taxes
584,100,000 1
 
579,800,000 1
 
1: Recorded as a net long-term Deferred Income Tax liability on the Consolidated Balance Sheet.