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Operating Revenues - Other Operating Revenues (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 1,947.5 | $ 1,608.0 | $ 1,590.2 | $ 2,377.4 | $ 2,076.8 | $ 1,643.7 | $ 1,672.5 | $ 2,286.5 | $ 7,523.1 | $ 7,679.5 | $ 7,648.5
Other operating revenues |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 73.8 | (0.8) |
Other operating revenues | Late payment charges |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 43.7 | 40.3 |
Other operating revenues | Alternative revenues |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | (9.6) | (45.6) |
Other operating revenues | Other |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Operating Revenues |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | $ 39.7 | $ 4.5 |

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