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SUMMARIZED QUARTERLY FINANCIAL DATA (Unaudited) (Tables)
 9 Months Ended
Sep. 30, 2014
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information Table

 
Nine Months Ended September 30, 2014
 
 
($ Millions)
First
 
Second
 
Third
 
 
Operating revenues
$
263.9

 
$
93.9

 
$
59.4

 
 
Operating income (loss)
72.4

 
1.9

 
(12.1
)
 
 
Net income (loss)
43.0

 
(0.6
)
 
(9.4
)
 
 
 
 
 
 
 
 
 
 
 
Calendar Year Ended December 31, 2013
($ Millions)
First
 
Second
 
Third
 
Fourth
Operating revenues
$
237.7

 
$
104.5

 
$
48.4

 
$
142.7

Operating income (loss)
79.3

 
2.2

 
(22.5
)
 
34.7

Net income (loss)
47.2

 
(0.7
)
 
(8.9
)
 
19.8