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Carty Generating Station (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Dec. 31, 2015 | Mar. 31, 2016
Property, Plant and Equipment [Line Items] |  |  |
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment | $ 587.0 | $ 424.0 |
Phase-in Plan, Amount of Costs Deferred for Rate-making Purposes |  | 514.0 |
Allowance for Funds Used During Construction, Capitalized Interest | 59.0 | 41.0 |
Malpractice Loss Contingency, Letters of Credit and Surety Bonds |  |  | $ 145.6
Construction work-in-progress | 746.0 | $ 545.0 |
Liability for Title Claims and Claims Adjustment Expense | 15.0 |  |
Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Construction work-in-progress | 640.0 |  |
Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Construction work-in-progress | $ 660.0 |  |

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- Definition The amount needed to reflect the estimated ultimate cost of settling asserted and unasserted claims estimated to have been incurred by the insureds on or before the balance sheet date pertaining to the existence of a lien, encumbrance, defect or other matter purportedly affecting the title to the interest as insured. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Liability for Claim Adjustment Expenses -URI http://asc.fasb.org/extlink&oid=6516805 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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- Definition Amount capitalized of allowance for funds used during construction. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 835 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501662&loc=d3e56162-110433 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Allowance for Funds Used during Construction -URI http://asc.fasb.org/extlink&oid=6504829 + Details
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