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Quarterly Financial Information (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information |
|  | Three Months Ended |
|  | March 31, |  |  | June 30, |  |  | September 30, |  |  | December 31, |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Total Operating Revenues |  | $ | 126.0 |  |  | $ | 125.8 |  |  | $ | 80.8 |  |  | $ | 74.5 |  |  | $ | 84.0 |  |  | $ | 78.8 |  |  | $ | 115.4 |  |  | $ | 104.3 |
Operating Income |  | $ | 26.1 |  |  | $ | 23.4 |  |  | $ | 10.5 |  |  | $ | 9.5 |  |  | $ | 9.5 |  |  | $ | 11.1 |  |  | $ | 23.6 |  |  | $ | 21.3 |
Net Income Applicable to Common |  | $ | 12.4 |  |  | $ | 10.9 |  |  | $ | 3.1 |  |  | $ | 2.5 |  |  | $ | 2.3 |  |  | $ | 3.5 |  |  | $ | 11.2 |  |  | $ | 10.2 |
|  | Three Months Ended |
|  | March 31, |  |  | June 30, |  |  | September 30, |  |  | December 31, |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
|  | Per Share Data: |
Earnings Per Common Share |  | $ | 0.88 |  |  | $ | 0.78 |  |  | $ | 0.23 |  |  | $ | 0.18 |  |  | $ | 0.16 |  |  | $ | 0.25 |  |  | $ | 0.79 |  |  | $ | 0.73 |
Dividends Paid Per Common Share |  | $ | 0.360 |  |  | $ | 0.355 |  |  | $ | 0.360 |  |  | $ | 0.355 |  |  | $ | 0.360 |  |  | $ | 0.355 |  |  | $ | 0.360 |  |  | $ | 0.355 |

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=84173487&loc=d3e1280-108306 + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration