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OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES - Other Non-Current Assets (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Other Postretirement Benefit Plans	$ 101.1	$ 106.3
Contract Assets	16.6	18.5
Operating Lease Right-of-use Assets	10.8	10.7
ALLETE Properties	10.4	10.8
Restricted Cash	2.5	2.4	$ 2.4	$ 2.3
Finance Lease Right-of-use Assets	2.0	2.1
Other	118.3	112.1
Total Other Non-Current Assets	$ 261.7	$ 262.9

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Other Postretirement Benefit Plans

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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as noncurrent.

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