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Operations and Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Inventories [Table Text Block]
Inventories – Net
March 31,
2017

 
December 31,
2016

Millions
 
 
 
Fuel (a)

$48.3

 

$43.9

Materials and Supplies
49.0

 
48.7

Raw Materials
2.9

 
2.9

Work in Progress
1.4

 
1.0

Finished Goods
9.9

 
8.6

Reserve for Obsolescence
(1.0
)
 
(0.9
)
Total Inventories – Net

$110.5

 

$104.2


(a)
Fuel consists primarily of coal inventory at Minnesota Power.
Prepayments and Other Current Assets [Table Text Block]
Prepayments and Other Current Assets
March 31,
2017

 
December 31,
2016

Millions
 
 
 
Deferred Fuel Adjustment Clause

$18.4

 

$18.6

Restricted Cash
9.1

 
2.2

Other
18.0

 
19.5

Total Prepayments and Other Current Assets

$45.5

 

$40.3
Other Non-Current Assets [Table Text Block]
Other Non-Current Assets
March 31,
2017

 
December 31,
2016

Millions
 
 
 
Contract Payment

$28.9

 

$29.6

Finance Receivable
11.5

 
11.5

Restricted Cash
8.6

 
8.6

Other
56.2

 
56.8

Total Other Non-Current Assets

$105.2

 

$106.5
Other Current Liabilities [Table Text Block]
Other Current Liabilities
March 31,
2017

 
December 31,
2016

Millions
 
 
 
PSAs

$24.6

 

$24.6

Contingent Consideration (a)
4.6

 
—

Other
41.4

 
49.1

Total Other Current Liabilities

$70.6

 

$73.7


(a)
Contingent Consideration relates to the estimated fair value of the earnings-based payment resulting from the U.S. Water Services acquisition. (See Note 5. Fair Value.)
Other Non-Current Liabilities [Table Text Block]
Other Non-Current Liabilities
March 31,
2017

 
December 31,
2016

Millions
 
 
 
Asset Retirement Obligation

$157.2

 

$136.6

PSAs
107.6

 
113.8

Contingent Consideration (a)
5.4

 
25.0

Other
46.7

 
47.3

Total Other Non-Current Liabilities

$316.9

 

$322.7


(a)
Contingent Consideration relates to the estimated fair value of the earnings-based payment resulting from the U.S. Water Services acquisition. (See Note 5. Fair Value.)
Supplemental Statement of Cash Flows Information [Table Text Block]
Supplemental Statement of Cash Flows Information.
Three Months Ended March 31,
2017

 
2016

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

$18.9

 

$19.6

Noncash Investing and Financing Activities
 

 
 

Decrease in Accounts Payable for Capital Additions to Property, Plant and Equipment
$(3.5)
 
$(25.6)
Capitalized Asset Retirement Costs

$19.3

 

$3.5

AFUDC–Equity

$0.2

 

$0.9

ALLETE Common Stock Contributed to the Pension Plan

$13.5

 
—