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REGULATORY ASSETS AND LIABILITIES - REGULATORY LIABILITIES (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Regulatory liabilities
Amounts refundable to customers	$ 155.8	$ 87.6
Regulatory liabilities	3,987.1	3,992.8
Total regulatory liabilities	4,142.9	4,080.4
Income tax related items
Regulatory liabilities
Total regulatory liabilities	2,222.9	2,248.8
Removal costs
Regulatory liabilities
Total regulatory liabilities	1,195.0	1,181.5
Pension and OPEB benefits
Regulatory liabilities
Total regulatory liabilities	349.5	354.9
Energy costs refundable through rate adjustments
Regulatory liabilities
Total regulatory liabilities	162.2	89.8
Electric transmission costs
Regulatory liabilities
Total regulatory liabilities	51.0	42.2
Earnings sharing mechanisms
Regulatory liabilities
Total regulatory liabilities	40.6	43.5
Uncollectible expense
Regulatory liabilities
Total regulatory liabilities	39.0	39.1
Energy efficiency programs
Regulatory liabilities
Total regulatory liabilities	35.6	30.7
Decoupling
Regulatory liabilities
Total regulatory liabilities	35.0	36.8
Other, net
Regulatory liabilities
Total regulatory liabilities	$ 12.1	$ 13.1

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
-URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394

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No definition available.

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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
-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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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
-Section S99
-Paragraph 1
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