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Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Data (Unaudited)
 
 
2012 Quarters ended  
 
2011 Quarters ended  
($ millions, except per share data)
 
 
Dec 
 
Sept
 
Jun 
 
Mar
 
 
Dec 
 
Sept
 
Jun
 
 
Mar
 
Revenues
 
$
149.7

 
$
133.5

 
$
136.3

 
$
131.0

 
$
118.8

 
$
125.9

 
$
109.8

 
$
116.5

Net income/(loss)
 
9.1

 
(30.2
)
 
2.5

 
9.1

 
7.2

 
(10.2
)
 
(5.0
)
 
5.9

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net earnings/(loss) per share
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Basic
 
$
0.04

 
$
(0.12
)
 
$
0.01

 
$
0.04

 
$
0.03

 
$
(0.04
)
 
$
(0.02
)
 
$
0.02

Diluted
 
0.03

 
(0.12
)
 
0.01

 
0.04

 
0.03

 
(0.04
)
 
(0.02
)
 
0.02