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Quarterly Financial Information - Unaudited (Notes)
 12 Months Ended
Dec. 31, 2013
Selected Quarterly Financial Information [Abstract]  
Quarterly Financial Information (Unaudited)
Note 18 - Quarterly Financial Information (Unaudited)

Following is a summary of unaudited quarterly financial information:
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
 
Year
 
(in millions, except per-share amounts)
2013
 
 
 
 
 
 
 
 
 
Revenues  
$
476.9

 
$
195.6

 
$
149.6

 
$
397.9

 
$
1,220.0

Operating income (loss)
131.4

 
71.2

 
(19.4
)
 
122.6

 
305.8

Net income (loss)
72.9

 
39.4

 
(19.2
)
 
68.1

 
161.2

Asset impairment charge, before income taxes
—

 
—

 
80.6

 
—

 
80.6

Basic earnings (loss) per common share
$
0.42

 
$
0.22

 
$
(0.11
)
 
$
0.39

 
$
0.92

Diluted earnings (loss) per common share
0.41

 
0.22

 
(0.11
)
 
0.39

 
0.92

 
 
 
 
 
 
 
 
 
 
2012
 
 
 
 
 
 
 
 
 
Revenues  
$
425.7

 
$
188.4

 
$
141.8

 
$
343.0

 
$
1,098.9

Operating income
130.9

 
72.6

 
63.6

 
108.6

 
375.7

Net income
75.2

 
39.2

 
33.8

 
63.8

 
212.0

Basic earnings per common share
$
0.42

 
$
0.22

 
$
0.20

 
$
0.36

 
$
1.20

Diluted earnings per common share
0.42

 
0.22

 
0.19

 
0.36

 
1.19