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Regulatory Assets and Liabilities - Regulatory Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Regulatory liabilities |  |
Other current liabilities | $ 14.3 | $ 51.0
Regulatory liabilities | 3,946.0 | 3,928.1
Total regulatory liabilities | 3,960.3 | 3,979.1
Income tax related items |  |
Regulatory liabilities |  |
Total regulatory liabilities | 1,998.5 | 2,137.7
Removal costs |  |
Regulatory liabilities |  |
Total regulatory liabilities | 1,248.0 | 1,221.1
Pension and OPEB benefits |  |
Regulatory liabilities |  |
Total regulatory liabilities | 397.3 | 378.1
Derivatives |  |
Regulatory liabilities |  |
Total regulatory liabilities | 124.1 | 16.4
Electric transmission costs |  |
Regulatory liabilities |  |
Total regulatory liabilities | 84.2 | 78.5
Uncollectible expense |  |
Regulatory liabilities |  |
Total regulatory liabilities | 37.1 | 25.5
Earnings sharing mechanisms |  |
Regulatory liabilities |  |
Total regulatory liabilities | 28.4 | 36.9
Energy costs refundable through rate adjustments |  |
Regulatory liabilities |  |
Total regulatory liabilities | 13.7 | 59.9
Other, net |  |
Regulatory liabilities |  |
Total regulatory liabilities | $ 29.0 | $ 25.0

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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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