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Quarterly Financial Information (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2018
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
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.