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REGULATORY ASSETS AND LIABILITIES - REGULATORY LIABILITIES (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Regulatory liabilities
Other current liabilities	$ 83.9	$ 14.3
Regulatory liabilities	4,000.1	3,946.0
Total regulatory liabilities	4,084.0	3,960.3
Income tax related items
Regulatory liabilities
Total regulatory liabilities	1,970.3	1,998.5
Removal costs
Regulatory liabilities
Total regulatory liabilities	1,252.2	1,248.0
Pension and OPEB benefits
Regulatory liabilities
Total regulatory liabilities	388.3	397.3
Derivatives
Regulatory liabilities
Total regulatory liabilities	247.7	124.1
Energy costs refundable through rate adjustments
Regulatory liabilities
Total regulatory liabilities	78.3	13.7
Electric transmission costs
Regulatory liabilities
Total regulatory liabilities	42.9	84.2
Uncollectible expense
Regulatory liabilities
Total regulatory liabilities	33.4	37.1
Earnings sharing mechanisms
Regulatory liabilities
Total regulatory liabilities	17.1	28.4
Other, net
Regulatory liabilities
Total regulatory liabilities	$ 53.8	$ 29.0

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- 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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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 405
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394

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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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