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Regulatory Assets and Liabilities - Regulatory Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Regulatory liabilities |  |
Current liabilities | $ 87.6 | $ 36.8
Regulatory liabilities | 3,992.8 | 4,251.6
Total regulatory liabilities | 4,080.4 | 4,288.4
Income tax related items |  |
Regulatory liabilities |  |
Total regulatory liabilities | 2,248.8 | 2,406.6
Removal costs |  |
Regulatory liabilities |  |
Total regulatory liabilities | 1,181.5 | 1,329.6
Pension and OPEB costs |  |
Regulatory liabilities |  |
Total regulatory liabilities | 354.9 | 238.3
Energy costs refundable through rate adjustments |  |
Regulatory liabilities |  |
Total regulatory liabilities | 89.8 | 39.6
Earnings sharing mechanisms |  |
Regulatory liabilities |  |
Total regulatory liabilities | 43.5 | 30.0
Electric transmission costs |  |
Regulatory liabilities |  |
Total regulatory liabilities | 42.2 | 9.7
Refunds due to customers offset against electric transmission regulatory liability | 38.6 |
Uncollectible expense |  |
Regulatory liabilities |  |
Total regulatory liabilities | 39.1 | 30.5
Decoupling |  |
Regulatory liabilities |  |
Total regulatory liabilities | 36.8 | 30.5
Energy efficiency programs |  |
Regulatory liabilities |  |
Total regulatory liabilities | 30.7 | 31.7
Derivatives |  |
Regulatory liabilities |  |
Total regulatory liabilities | 6.7 | 16.4
Mines deferral |  |
Regulatory liabilities |  |
Total regulatory liabilities | 0.0 | 120.8
Other, net |  |
Regulatory liabilities |  |
Total regulatory liabilities | $ 6.4 | $ 4.7

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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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