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Quarterly Financial Information (Unaudited)
 12 Months Ended
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]  
QUARTERLY FINANCIAL INFORMATION (UNAUDITED)
QUARTERLY FINANCIAL INFORMATION (Unaudited)
(in millions)
 
First Quarter
 
Second Quarter
 
Third Quarter
 
Fourth Quarter
 
Total
2016
 
 
 
 
 
 
 
 
 
 
Operating revenues
 
$
975.5

 
$
877.2

 
$
1,023.8

 
$
916.3

 
$
3,792.8

Operating income
 
181.5

 
146.9

 
196.4

 
104.7

 
629.5

Net income attributed to common shareholder
 
107.3

 
82.6

 
115.2

 
59.2

 
364.3

 
 
 
 
 
 
 
 
 
 
 
2015
 
 
 
 
 
 
 
 
 
 
Operating revenues
 
$
1,084.6

 
$
883.0

 
$
981.1

 
$
905.4

 
$
3,854.1

Operating income
 
204.7

 
128.7

 
169.8

 
145.7

 
648.9

Net income attributed to common shareholder
 
121.4

 
74.6

 
100.1

 
79.6

 
375.7



Due to various factors, the quarterly results of operations are not necessarily comparable.