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Quarterly Financial Information (Unaudited) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
QUARTERLY FINANCIAL INFORMATION (UNAUDITED) | QUARTERLY FINANCIAL INFORMATION (Unaudited)
(in millions, except per share amounts) |  | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter |  | Total
2018 |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $ | 2,286.5 |  |  | $ | 1,672.5 |  |  | $ | 1,643.7 |  |  | $ | 2,076.8 |  |  | $ | 7,679.5 |
Operating income |  | 545.1 |  |  | 330.8 |  |  | 302.7 |  |  | 289.8 |  |  | 1,468.4 |
Net income attributed to common shareholders |  | 390.1 |  |  | 231.0 |  |  | 233.2 |  |  | 205.0 |  |  | 1,059.3 |
Earnings per share (1) |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 1.24 |  |  | $ | 0.73 |  |  | $ | 0.74 |  |  | $ | 0.65 |  |  | $ | 3.36 |
Diluted |  | 1.23 |  |  | 0.73 |  |  | 0.74 |  |  | 0.65 |  |  | 3.34 |
2017 |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $ | 2,304.5 |  |  | $ | 1,631.5 |  |  | $ | 1,657.5 |  |  | $ | 2,055.0 |  |  | $ | 7,648.5 |
Operating income (2) |  | 614.7 |  |  | 362.2 |  |  | 392.2 |  |  | 407.0 |  |  | 1,776.1 |
Net income attributed to common shareholders |  | 356.6 |  |  | 199.1 |  |  | 215.4 |  |  | 432.6 |  |  | 1,203.7 |
Earnings per share (1) |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 1.13 |  |  | $ | 0.63 |  |  | $ | 0.68 |  |  | $ | 1.37 |  |  | $ | 3.81 |
Diluted |  | 1.12 |  |  | 0.63 |  |  | 0.68 |  |  | 1.36 |  |  | 3.79 |
(1) | 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.
(2) | Includes the retroactive restatement impacts of the implementation of ASU 2017-07. See Note 18, Employee Benefits, for more information on this new standard.

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- References No definition available. + Details
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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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