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Operations and Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Supplemental Statement of Cash Flow Information [Table Text Block]
Supplemental Statement of Cash Flow Information.
Consolidated Statement of Cash Flows
 
 
 
Year Ended December 31
2016

2015

2014

Millions
 
 
 
Cash Paid During the Period for Interest – Net of Amounts Capitalized

$68.2


$59.0


$51.3

Cash Paid During the Period for Income Taxes

$0.5


$0.4


$5.1

Noncash Investing and Financing Activities
 
 
 
Increase (Decrease) in Accounts Payable for Capital Additions to Property, Plant and Equipment
$(22.0)
$(40.6)

$21.7

Capitalized Asset Retirement Costs

$3.7


$12.4

$22.4
Camp Ripley Solar Project Financing

$15.0

—

—

AFUDC–Equity

$2.1


$3.3


$7.8

ALLETE Common Stock Contributed to the Defined Benefit Pension Plan
—

—

$19.5
Contingent Consideration
—


$35.7

—

ALLETE Common Stock Received for Sale of Land Inventory

$8.0

—

—

Long-Term Finance Receivable for Land Inventory

$12.0

—

—
Accounts Receivable [Table Text Block]
Accounts Receivable
 
 
 
As of December 31
2016

 
2015

Millions
 
 
 
Trade Accounts Receivable
 
 
 
Billed

$106.5

 

$105.3

Unbilled
19.1

 
16.9

Less: Allowance for Doubtful Accounts
3.1

 
1.0

Total Accounts Receivable

$122.5

 

$121.2
Inventories – Net [Table Text Block]
Inventories – Net
 
 
 
As of December 31
2016

 
2015

Millions
 
 
 
Fuel (a)

$43.9

 

$58.1

Materials and Supplies
48.7

 
49.1

Raw Materials
2.9

 
2.7

Work in Progress
1.0

 
—

Finished Goods
8.6

 
7.5

Reserve for Obsolescence
(0.9
)
 
(0.3
)
Total Inventories

$104.2

 

$117.1


(a)
Fuel consists primarily of coal inventory at Minnesota Power.
Prepayments and Other Current Assets [Table Text Block]
Prepayments and Other Current Assets
 
 
 
As of December 31
2016

 
2015

Millions
 
 
 
Deferred Fuel Adjustment Clause

$18.6

 

$10.6

Restricted Cash (a)
2.2

 
5.6

Other
19.5

 
19.5

Total Prepayments and Other Current Assets

$40.3

 

$35.7


(a)
Restricted Cash includes collateral deposits required under ALLETE Clean Energy’s loan agreements and collateral deposits required for U.S. Water Services’ standby letters of credit.
Other Non-Current Assets [Table Text Block]
Other Non-Current Assets
 
 
 
As of December 31
2016

 
2015

Millions
 
 
 
Contract Payment (a)

$29.6

 
—

Finance Receivable (b)
11.5

 
—

Restricted Cash (c)
8.6

 

$8.1

Other
56.8

 
60.0

Total Other Non-Current Assets

$106.5

 

$68.1

(a)
Contract Payment includes a $31.0 million payment made to Cliffs as part of a long-term PSA between Minnesota Power and Silver Bay Power. The contract payment is being amortized over the term of the PSA. (See Note 11. Commitments, Guarantees and Contingencies.)
(b)
On September 22, 2016, ALLETE Properties sold its Ormond Crossings project and Lake Swamp wetland mitigation bank for consideration of approximately $21 million. The consideration included a down payment in the form of 0.1 million shares of ALLETE common stock with a value of $8.0 million. The remaining purchase price will be paid under the terms of a finance receivable due over a five-year period which bears interest at market rates and is collateralized by the property sold.
(c)
Restricted Cash includes collateral deposits required under ALLETE Clean Energy’s loan agreements and PSAs, and deposits from SWL&P customers in aid of future capital expenditures.
Other Current Liabilities [Table Text Block]
Other Current Liabilities
 
 
 
As of December 31
2016

 
2015

Millions
 
 
 
Customer Deposits

$5.4

 

$15.1

Power Sales Agreements
24.6

 
23.3

Other
43.7

 
47.7

Total Other Current Liabilities

$73.7

 

$86.1
Other Non-Current Liabilities [Table Text Block]
Other Non-Current Liabilities
 
 
 
As of December 31
2016

 
2015

Millions
 
 
 
Asset Retirement Obligation

$136.6

 

$131.4

Power Sales Agreements
113.8

 
138.1

Contingent Consideration (a)
25.0

 
36.6

Other
47.3

 
42.9

Total Other Non-Current Liabilities

$322.7

 

$349.0


(a)
Contingent Consideration relates to the estimated fair value of the earnings-based payment resulting from the U.S. Water Services acquisition. (See Note 6. Acquisitions and Note 9. Fair Value.)
Operating Expenses – Other [Table Text Block]
Operating Expenses – Other
 
 
 
Year Ended December 31
2016

2015

2014

Millions
 
 
 
Impairment of Real Estate (a)
—


$36.3

—

Impairment of Goodwill (b)

$3.3

—

—

Change in Fair Value of Contingent Consideration (c)
(13.6
)
—

—

Total Operating Expenses – Other
$(10.3)

$36.3

—

(a)
See Impairment of Long-Lived Assets.
(b)
See Goodwill and Intangible Assets.
(c)
See Note 9. Fair Value.