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Operations and Significant Accounting Policies (Tables)
 6 Months Ended
Jun. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Inventories [Table Text Block]
Inventories
June 30,
2016

 
December 31,
2015

Millions
 
 
 
Fuel (a)

$49.2

 

$58.1

Materials and Supplies
49.8

 
49.1

Raw Materials
2.8

 
2.7

Work in Progress
0.6

 
—

Finished Goods
8.3

 
7.5

Reserve for Obsolescence
(0.3
)
 
(0.3
)
Total Inventories

$110.4

 

$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
June 30,
2016

 
December 31,
2015

Millions
 
 
 
Deferred Fuel Adjustment Clause

$14.5

 

$10.6

Restricted Cash (a)
7.5

 
5.6

Other
16.4

 
19.5

Total Prepayments and Other Current Assets

$38.4

 

$35.7


(a)
Restricted Cash includes collateral deposits required under ALLETE Clean Energy’s loan agreements and cash pledged as collateral for U.S. Water Services’ standby letters of credit.
Other Current Liabilities [Table Text Block]
Other Current Liabilities
June 30,
2016

 
December 31,
2015

Millions
 
 
 
Customer Deposits

$13.4

 

$15.1

Power Purchase Agreements
23.9

 
23.3

Other
48.6

 
47.7

Total Other Current Liabilities

$85.9

 

$86.1
Other Non-Current Liabilities [Table Text Block]
Other Non-Current Liabilities
June 30,
2016

 
December 31,
2015

Millions
 
 
 
Asset Retirement Obligation

$135.2

 

$131.4

Power Purchase Agreements
125.9

 
138.1

Contingent Consideration (a)
37.3

 
36.6

Other
42.4

 
42.9

Total Other Non-Current Liabilities

$340.8

 

$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 3. Acquisitions and Note 5. Fair Value.)
Supplemental Statement of Cash Flows Information [Table Text Block]
Supplemental Statement of Cash Flows Information.
Six Months Ended June 30,
2016

 
2015

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

$32.9

 

$30.0

Cash Paid During the Period for Income Taxes

$0.4

 

$1.0

Noncash Investing and Financing Activities
 

 
 

Decrease in Accounts Payable for Capital Additions to Property, Plant and Equipment
$(24.4)
 
$(25.5)
Capitalized Asset Retirement Costs

$2.3

 

$7.8

AFUDC–Equity

$1.2

 

$1.6

Contingent Consideration
—

 

$35.7