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Regulatory Assets and Liabilities - Regulatory Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Regulatory liabilities |  |
Other current liabilities | $ 51.0 | $ 87.6
Regulatory liabilities | 3,928.1 | 3,992.8
Total regulatory liabilities | 3,979.1 | 4,080.4
Income tax related items |  |
Regulatory liabilities |  |
Total regulatory liabilities | 2,137.7 | 2,248.8
Removal costs |  |
Regulatory liabilities |  |
Total regulatory liabilities | 1,221.1 | 1,181.5
Pension and OPEB benefits |  |
Regulatory liabilities |  |
Total regulatory liabilities | 378.1 | 354.9
Electric transmission costs |  |
Regulatory liabilities |  |
Total regulatory liabilities | 78.5 | 42.2
Earnings sharing refunds offsetting electric transmission regulatory liability |  | 38.6
Energy costs refundable through rate adjustments |  |
Regulatory liabilities |  |
Total regulatory liabilities | 59.9 | 89.8
Earnings sharing mechanisms |  |
Regulatory liabilities |  |
Total regulatory liabilities | 36.9 | 43.5
Earnings sharing mechanisms | WE |  |
Regulatory liabilities |  |
Total regulatory liabilities | 0.0 |
Uncollectible expense |  |
Regulatory liabilities |  |
Total regulatory liabilities | 25.5 | 39.1
Derivatives |  |
Regulatory liabilities |  |
Total regulatory liabilities | 16.4 | 6.7
Energy efficiency programs |  |
Regulatory liabilities |  |
Total regulatory liabilities | 9.9 | 30.7
Decoupling |  |
Regulatory liabilities |  |
Total regulatory liabilities | 5.2 | 36.8
Other, net |  |
Regulatory liabilities |  |
Total regulatory liabilities | $ 9.9 | $ 6.4

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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 + Details
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- Definition 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 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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