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Quarterly Financial Information (Unaudited)
 12 Months Ended
Dec. 31, 2017
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
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.