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Quarterly Financial Information (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information (unaudited) |
(in millions, except per share amounts) |  | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter |  | Total
2017 |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $ | 2,304.5 |  |  | $ | 1,631.5 |  |  | $ | 1,657.5 |  |  | $ | 2,055.0 |  |  | $ | 7,648.5 |
Operating income |  | 617.3 |  |  | 362.2 |  |  | 393.6 |  |  | 412.1 |  |  | 1,785.2 |
Net income attributed to common shareholders |  | 356.6 |  |  | 199.1 |  |  | 215.4 |  |  | 432.6 |  |  | 1,203.7 |
Earnings per share * |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 1.13 |  |  | $ | 0.63 |  |  | $ | 0.68 |  |  | $ | 1.37 |  |  | $ | 3.81 |
Diluted |  | 1.12 |  |  | 0.63 |  |  | 0.68 |  |  | 1.36 |  |  | 3.79 |
2016 |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $ | 2,194.8 |  |  | $ | 1,602.0 |  |  | $ | 1,712.5 |  |  | $ | 1,963.0 |  |  | $ | 7,472.3 |
Operating income |  | 589.3 |  |  | 332.1 |  |  | 399.0 |  |  | 361.7 |  |  | 1,682.1 |
Net income attributed to common shareholders |  | 346.2 |  |  | 181.4 |  |  | 217.0 |  |  | 194.4 |  |  | 939.0 |
Earnings per share * |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 1.10 |  |  | $ | 0.57 |  |  | $ | 0.69 |  |  | $ | 0.62 |  |  | $ | 2.98 |
Diluted |  | 1.09 |  |  | 0.57 |  |  | 0.68 |  |  | 0.61 |  |  | 2.96 |
* | Earnings per share for the individual quarters may not total the year ended earnings per share amount because of changes to the average number of shares outstanding and changes in incremental issuable shares throughout the year.

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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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