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REGULATORY ASSETS AND LIABILITIES - REGULATORY LIABILITIES (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Regulatory liabilities
Other current liabilities	$ 61.0	$ 45.3
Regulatory liabilities	3,940.3	3,958.0
Total regulatory liabilities	4,001.3	4,003.3
Income tax related items
Regulatory liabilities
Total regulatory liabilities	1,808.0	1,825.4
Removal costs
Regulatory liabilities
Total regulatory liabilities	1,552.3	1,458.2
Pension and OPEB benefits
Regulatory liabilities
Total regulatory liabilities	292.0	308.5
Uncollectible expense
Regulatory liabilities
Total regulatory liabilities	89.2	47.2
Energy costs refundable through rate adjustments
Regulatory liabilities
Total regulatory liabilities	71.4	160.8
Derivatives
Regulatory liabilities
Total regulatory liabilities	35.5	36.9
Revenue requirements of renewable generation facilities
Regulatory liabilities
Total regulatory liabilities	21.5	44.2
MERC property tax tracker
Regulatory liabilities
Total regulatory liabilities	21.0	19.3
Other, net
Regulatory liabilities
Total regulatory liabilities	$ 110.4	$ 102.8

X

- Definition

The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 980
-SubTopic 405
-Name Accounting Standards Codification
-Section 25
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477571/980-405-25-1

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- Definition

The amount for the individual regulatory current liability as itemized in a table of regulatory current liabilities as of the end of the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 980
-SubTopic 405
-Name Accounting Standards Codification
-Section 25
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477571/980-405-25-1

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(24))
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