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Rate Matters and Regulation Rate Matters and Regulation (Details) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2018	Dec. 31, 2017
Public Utilities, Approved Rate Increase (Decrease), Amount		$ 64.0
Public Utilities, Approved Return on Equity, Percentage		9.50%
Public Utilities, Approved Equity Capital Structure, Percentage		53.00%
Public Utilities, Approved Debt Capital Structure, Percentage		47.00%
Interim Rate Revenue Reserved		$ 32.8
Current Regulatory Assets		19.7	$ 40.8
Recommended Disallowance for Fuel Adjustment		3.3
Refund for Fuel Adjustment		2.4
Dry Scrubber Project [Member]
Public Utilities, Property, Plant and Equipment, Construction Work in Progress		451.6
Estimated Environmental Capital Costs		542.4
Mustang Modernization [Member]
Public Utilities, Property, Plant and Equipment, Construction Work in Progress		376.3
Estimated Environmental Capital Costs		385.0
OKLAHOMA
Interim Rate Revenue Reserved		5.6
Oklahoma demand program rider under recovery (A)
Current Regulatory Assets	[1]	16.7	$ 31.6
January 16, 2018 [Member] | OKLAHOMA
Public Utilities, Requested Rate Increase (Decrease), Amount		$ 1.9
Public Utilities, Requested Return on Equity, Percentage		9.90%
FERC [Member]
Public Utilities, Approved Return on Equity, Percentage		10.60%
Recommended Common Equity Percentage		7.85%
Revenue impact of recommended change in return on common equity		$ 1.5
[1] Included in Other Current Assets on the Condensed Consolidated Balance Sheets.

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Percentage of public utility's approved debt to capital, including debt and equity.

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Amount of public utility's approved rate increase (decrease) by regulatory agency.

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Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382

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