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Quarterly Financial Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Operating Revenues | $ 116.9 | $ 87.4 | $ 83.9 | $ 130.4 | $ 116.4 | $ 85.3 | $ 84.4 | $ 152.1 | $ 418.6 | $ 438.2 | $ 444.1
Operating Income | 25.3 | 7.4 | 11.1 | 27.6 | 22.0 | 10.0 | 12.3 | 28.8 | 71.4 | 73.1 | 71.2
Net Income Applicable to Common | $ 13.6 | $ 0.3 | $ 3.1 | $ 15.2 | $ 11.4 | $ 2.3 | $ 4.0 | $ 26.5 | $ 32.2 | $ 44.2 | $ 33.0
Per Share Data: |  |  |  |  |  |  |  |  |  |  |
Earnings Per Common Share | $ 0.90 | $ 0.02 | $ 0.21 | $ 1.02 | $ 0.77 | $ 0.15 | $ 0.27 | $ 1.78 | $ 2.15 | $ 2.97 | $ 2.23
Dividends Paid Per Common Share | $ 0.375 | $ 0.375 | $ 0.375 | $ 0.375 | $ 0.37 | $ 0.37 | $ 0.37 | $ 0.37 |  |  |

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