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REGULATORY ASSETS AND LIABILITIES - REGULATORY LIABILITIES (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Regulatory liabilities
Current liabilities	$ 25.6	$ 41.8
Regulatory liabilities	3,960.3	3,718.6
Total regulatory liabilities	3,985.9	3,760.4
Income tax
Regulatory liabilities
Total regulatory liabilities	2,279.1	2,134.1
Removal costs
Regulatory liabilities
Total regulatory liabilities	1,313.4	1,294.9
Mines deferral
Regulatory liabilities
Total regulatory liabilities	115.4	95.1
Unrecognized pension and OPEB costs
Regulatory liabilities
Total regulatory liabilities	106.5	114.2
Energy efficiency programs
Regulatory liabilities
Total regulatory liabilities	30.0	21.1
Energy costs refundable through rate adjustments
Regulatory liabilities
Total regulatory liabilities	25.2	42.0
Uncollectible expense
Regulatory liabilities
Total regulatory liabilities	23.9	24.7
Decoupling
Regulatory liabilities
Total regulatory liabilities	22.8	1.8
Earnings sharing mechanisms
Regulatory liabilities
Total regulatory liabilities	20.6	2.5
Other, net
Regulatory liabilities
Total regulatory liabilities	$ 49.0	$ 30.0

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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
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-Topic 980
-SubTopic 405
-Section 25
-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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