Operations and Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2014

Operations and Significant Accounting Policies [Abstract]

Inventories [Table Text Block]

Inventories	March 31, 2014		December 31, 2013
Millions
Fuel		$16.3		$13.1
Materials and Supplies	52.6		46.2
Total Inventories		$68.9		$59.3

Prepayments and Other Current Assets [Table Text Block]

Prepayments and Other Current Assets	March 31, 2014		December 31, 2013
Millions
Deferred Fuel Adjustment Clause		$22.1		$23.0
Other	11.3		12.1
Total Prepayments and Other Current Assets		$33.4		$35.1

Other Current and Non-Current Liabilities [Table Text Block]

Other Current Liabilities	March 31, 2014		December 31, 2013
Millions
Customer Deposits		$24.1		$26.0
Power Purchase Agreements (a)	13.1		—
Other	24.0		26.6
Total Other Current Liabilities		$61.2		$52.6

(a) Power Purchase Agreements were acquired in conjunction with the ALLETE Clean Energy wind energy facilities acquisition on January 30, 2014 (see Note 4. Acquisitions).

NOTE 1.  OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES (Continued)

Other Non-Current Liabilities	March 31, 2014		December 31, 2013
Millions
Asset Retirement Obligation		$89.2		$81.8
Power Purchase Agreements (a)	96.4		—
Other	43.7		45.4
Total Other Non-Current Liabilities		$229.3		$127.2

(a) Power Purchase Agreements were acquired in conjunction with the ALLETE Clean Energy wind energy facilities acquisition on January 30, 2014 (see Note 4. Acquisitions).

Supplemental Statement of Cash Flows Information [Table Text Block]

Supplemental Statement of Cash Flows Information.

For the Three Months Ended March 31,	2014		2013
Millions
Cash Paid During the Period for Interest – Net of Amounts Capitalized		$12.4		$12.0
Cash Paid During the Period for Income Taxes		$0.2		$0.5
Noncash Investing and Financing Activities
Decrease in Accounts Payable for Capital Additions to Property, Plant and Equipment	$(22.6)		$(26.2)
Capitalized Asset Retirement Costs		$0.6		$1.9
AFUDC – Equity		$1.8		$1.1
ALLETE Common Stock Contributed to the Pension Plan		$19.5	—