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Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Summarized quarterly financial data
Summarized quarterly financial data for 2017 and 2016 follows:
(In millions, except per share amounts)
 
Q1
 
Q2
 
Q3
 
Q4
2017
 
 
 
 

 
 

 
 

 
 

 
 
Operating revenues
 
$
624.5

 
$
630.7

 
$
691.2

 
$
711.0

 
 
Operating income
 
101.4

 
72.8

 
107.5

 
36.8

 
 
Net income
 
55.4

 
37.6

 
61.9

 
61.2

 
 
Earnings per share:
 
 
 
 
 
 
 
 
 
 
Basic and Diluted
 
$
0.67

 
$
0.45

 
$
0.75

 
$
0.74

2016
 
 
 
 
 
 
 
 
 
 
 
 
Operating revenues
 
$
584.8

 
$
533.7

 
$
631.0

 
$
699.0

 
 
Operating income
 
92.2

 
63.9

 
105.5

 
120.7

 
 
Net income
 
48.3

 
32.3

 
61.4

 
69.6

 
 
Earnings per share:
 
 
 
 
 
 
 
 
 
 
Basic and Diluted
 
$
0.58

 
$
0.39

 
$
0.74

 
$
0.84