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Earnings Per Share and Common Stock (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Abstract]
Antidilutive Shares Excluded from Diluted Earnings Per Share Computation			0.0	0.0
Earnings Per Share - Basic [Abstract]
Net Income Attributable to ALLETE	$ 24.8	$ 22.5	$ 70.7	$ 62.4
Average Common Shares	49.3	48.6	49.2	47.7
Earnings Per Share	$ 0.50	$ 0.46	$ 1.44	$ 1.31
Earnings Per Share - Diluted [Abstract]
Net Income Attributable to ALLETE	$ 24.8	$ 22.5	$ 70.7	$ 62.4
Average Common Shares	49.5	48.7	49.3	47.8
Earnings Per Share	$ 0.50	$ 0.46	$ 1.43	$ 1.30
Dilutive Securities (Shares)	0.2	0.1	0.1	0.1

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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