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Comprehensive Income (Loss) (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Net Income	$ 20.5	$ 19.5	$ 74.5	$ 61.7
Other Comprehensive Income (Loss) [Abstract]
Unrealized Gain (Loss) on Securities, Net of income taxes of $(1.1), $0.3, $(0.3) and $(0.1)	(1.4)	0.4	(0.3)	(0.1)
Unrealized Loss on Derivatives, Net of income taxes of $(0.2), $-, $(0.2) and $-	(0.3)	0	(0.3)	0
Defined Benefit Pension and Other Postretirement Plans, Net of income taxes of $0.3, $0.2, $0.8 and $0.7	0.3	0.3	1.1	0.9
Total Other Comprehensive Income (Loss)	(1.4)	0.7	0.5	0.8
Total Comprehensive Income	19.1	20.2	75.0	62.5
Less: Non-Controlling Interest in Subsidiaries	0	(0.1)	(0.2)	(0.3)
Comprehensive Income Attributable to ALLETE	$ 19.1	$ 20.3	$ 75.2	$ 62.8

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- Definition

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

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The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the economic entity, including both controlling (parent) and noncontrolling interests. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, including any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

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The portion of net Income or Loss attributable to the noncontrolling interest (if any) deducted in order to derive the portion attributable to the parent.

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Change in accumulated gains and losses from derivative instrument designated and qualifying as the effective portion of cash flow hedges, net of tax effect. The after tax effect change includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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