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REGULATORY ASSETS AND LIABILITIES - REGULATORY LIABILITIES (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Regulatory liabilities
Other current liabilities	$ 145.0	$ 56.4
Regulatory liabilities	3,689.8	3,735.5
Total regulatory liabilities	3,834.8	3,791.9
Income tax related items
Regulatory liabilities
Total regulatory liabilities	1,945.4	1,956.6
Removal costs
Regulatory liabilities
Total regulatory liabilities	1,279.3	1,260.9
Pension and OPEB benefits
Regulatory liabilities
Total regulatory liabilities	335.3	340.5
Energy costs refundable through rate adjustments
Regulatory liabilities
Total regulatory liabilities	138.5	53.4
Derivatives
Regulatory liabilities
Total regulatory liabilities	21.6	76.7
Decoupling
Regulatory liabilities
Total regulatory liabilities	21.1	20.2
Uncollectible expense
Regulatory liabilities
Total regulatory liabilities	20.1	24.0
Energy efficiency programs
Regulatory liabilities
Total regulatory liabilities	18.5	10.4
Other, net
Regulatory liabilities
Total regulatory liabilities	$ 55.0	$ 49.2

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 405
-Section 25
-Paragraph 1
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+ References

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-Name Accounting Standards Codification
-Topic 980
-SubTopic 405
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-Paragraph 1
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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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