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Operations and Significant Accounting Policies - Other Non-Current Assets (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Contract asset - noncurrent	$ 15.9	$ 18.5
ALLETE Properties	10.3	10.8
Restricted Cash	2.5	2.4	$ 2.3
Other Postretirement Benefit Plans	107.6	106.3
Other	134.2	124.9
Total Other Non-Current Assets	$ 270.5	$ 262.9

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Amount of other miscellaneous assets expected to be realized or consumed after one year or normal operating cycle, if longer.

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