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Income Taxes (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Non-Current Regulatory Liabilities | $ 1,296.1 | $ 1,283.4
Interim Rate Revenue Reserved | 32.8 |
Income taxes recoverable from customers, net [Member] |  |
Non-Current Regulatory Liabilities | $ 1,028.0 |

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- Definition Interim Rate Revenue Reserved + References No definition available. + 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=6877327&loc=d3e13212-122682 + Details
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- Details
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