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Quarterly Data
 12 Months Ended
Dec. 31, 2011
Quarterly Financial Data [Abstract]  
Quarterly Financial Information [Text Block]
QUARTERLY FINANCIAL DATA (UNAUDITED)
 
 
2011 Quarters ended  
 
2010 Quarters ended  
($ millions, except per share data)
 
 
Dec. 31
 
 
Sept. 30
 
 
Jun. 30
 
 
Mar. 31
 
 
Dec. 31
 
 
Sept. 30
 
 
Jun. 30
 
 
Mar. 31
 
Revenues
 
$
118.8

 
$
125.9

 
$
109.8

 
$
116.5

 
$
105.4

 
$
103.7

 
$
120.3

 
$
103.3

Net income/(loss)
 
7.2

 
(10.2
)
 
(5.0
)
 
5.9

 
(12.2
)
 
15.9

 
(5.6
)
 
(9.3
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net earnings/(loss) per share
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Basic
 
0.028

 
(0.039
)
 
(0.020
)
 
0.023

 
(0.045
)
 
0.062

 
(0.022
)
 
(0.036
)
Diluted
 
$
0.028

 
$
(0.039
)
 
$
(0.020
)
 
$
0.023

 
$
(0.044
)
 
$
0.061

 
$
(0.022
)
 
$
(0.036
)