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Quarterly Financial Data (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Data [Abstract]  
Schedule of Quarterly Financial Information [Table Text Block]
In the Company's opinion, the following quarterly financial data includes all adjustments, consisting of normal recurring adjustments, necessary to fairly present such amounts. Summarized consolidated quarterly unaudited financial data is as follows:
Quarter Ended (In millions, except per share data)
 
March 31
June 30
September 30
December 31
Total
Operating revenues
2018
$
492.7

$
567.0

$
698.8

$
511.8

$
2,270.3

 
2017
$
456.0

$
586.4

$
716.8

$
501.9

$
2,261.1

Operating income
2018
$
66.6

$
137.7

$
227.3

$
58.0

$
489.6

 
2017
$
49.8

$
147.3

$
249.1

$
85.7

$
531.9

Net income
2018
$
55.0

$
110.7

$
205.1

$
54.7

$
425.5

 
2017
$
36.0

$
104.8

$
183.4

$
294.8

$
619.0

Basic earnings per average common share (A)
2018
$
0.28

$
0.55

$
1.03

$
0.27

$
2.13


2017
$
0.18

$
0.52

$
0.92

$
1.48

$
3.10

Diluted earnings per average common share (A)
2018
$
0.27

$
0.55

$
1.02

$
0.27

$
2.12


2017
$
0.18

$
0.52

$
0.92

$
1.48

$
3.10

(A)
Due to the impact of dilution on the earnings per share calculation, quarterly earnings per share amounts may not add to the total.