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Operations and Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2012

Operations and Significant Accounting Policies [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	2012			2011			2010
Millions
Cash Paid During the Period for Interest – Net of Amounts Capitalized		$42.7			$43.2			$35.7
Cash Received During the Period for Income Taxes (a)	—			$(11.4)			$(54.2)
Noncash Investing and Financing Activities
Increase in Accounts Payable for Capital Additions to Property, Plant and Equipment		$20.2			$5.9		$7.5
Capitalized Asset Retirement Costs		$17.1			$0.3			$2.8
AFUDC – Equity		$5.1			$2.5			$4.2
ALLETE Common Stock Contributed to the Pension Plan	—			$(20.0)			—


(a)	Due to bonus depreciation provisions in 2009 and 2010 federal legislation, NOLs were generated which resulted in little or no estimated tax payments, and refunds were received from NOL carrybacks against prior years’ taxable income.

Accounts Receivable [Table Text Block]



Accounts Receivable
As of December 31	2012				2011
Millions
Trade Accounts Receivable
Billed		$70.4				$63.7
Unbilled	17.4				15.6
Less: Allowance for Doubtful Accounts	1.0				0.9
Total Trade Accounts Receivable	86.8				78.4
Income Taxes Receivable	2.2				1.3
Total Accounts Receivable - Net		$89.0				$79.7

Inventories [Table Text Block]



Inventories
As of December 31	2012				2011
Millions
Fuel		$28.0				$28.6
Materials and Supplies	41.8				40.5
Total Inventories		$69.8				$69.1

Prepayments and Other Current Assets [Table Text Block]



Prepayments and Other Current Assets
As of December 31	2012				2011
Millions
Deferred Fuel Adjustment Clause		$22.5				$17.5
Other	11.1				9.6
Total Prepayments and Other Current Assets		$33.6				$27.1

Other Liabilities [Table Text Block]



Other Current Liabilities
As of December 31	2012				2011
Millions
Customer Deposits (a)		$28.8				$16.3
Other	33.8				29.3
Total Other Current Liabilities		$62.6				$45.6


(a)	Customer deposits were higher in 2012 primarily due to customer security deposits for capital expenditures relating to a transmission project.



Other Non-Current Liabilities
As of December 31	2012				2011
Millions
Asset Retirement Obligation		$77.9				$57.0
Other	45.4				48.1
Total Other Non-Current Liabilities		$123.3				$105.1