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REGULATORY ASSETS AND LIABILITIES - REGULATORY LIABILITIES (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Regulatory liabilities
Other current liabilities	$ 73.1	$ 87.6
Regulatory liabilities	3,939.3	3,992.8
Total regulatory liabilities	4,012.4	4,080.4
Income tax related items
Regulatory liabilities
Total regulatory liabilities	2,163.8	2,248.8
Removal costs
Regulatory liabilities
Total regulatory liabilities	1,213.3	1,181.5
Pension and OPEB benefits
Regulatory liabilities
Total regulatory liabilities	337.8	354.9
Energy costs refundable through rate adjustments
Regulatory liabilities
Total regulatory liabilities	76.8	89.8
Electric transmission costs
Regulatory liabilities
Total regulatory liabilities	70.8	42.2
Derivatives
Regulatory liabilities
Total regulatory liabilities	35.5	6.7
Uncollectible expense
Regulatory liabilities
Total regulatory liabilities	34.1	39.1
Earnings sharing mechanisms
Regulatory liabilities
Total regulatory liabilities	33.6	43.5
Decoupling
Regulatory liabilities
Total regulatory liabilities	25.6	36.8
Energy efficiency programs
Regulatory liabilities
Total regulatory liabilities	13.3	30.7
Other, net
Regulatory liabilities
Total regulatory liabilities	$ 7.8	$ 6.4

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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

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-Topic 980
-SubTopic 405
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-Paragraph 1
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The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent 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 210
-SubTopic 10
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-Paragraph 1
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