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Supplemental Financial Information Quarterly Results (Tables)
 12 Months Ended
Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]  
Unaudited Quarterly Results
The following represents the Company’s unaudited quarterly results for the years ended December 31, 2012 and 2011. These quarterly results were prepared in accordance with U.S. generally accepted accounting principles and reflect all adjustments that are, in the opinion of management, necessary for a fair presentation of the results.

 
For the Three Months Ended
 
March 31,
2012
 
June 30,
2012
 
Sept. 30,
2012
 
Dec. 31,
2012
 
(in millions, except per share data)
Total revenues
$
82.7

 
$
47.3

 
$
62.7

 
$
92.3

Total expenses
57.9

 
43.8

 
48.8

 
64.2

Income before taxes
24.8

 
3.5

 
13.9

 
28.1

Provision for taxes
8.7

 
1.3

 
5.3

 
13.0

Net income allocated to common stockholders
$
16.1

 
$
2.2

 
$
8.6

 
$
15.1

Earnings per share:
 
 
 
 
 
 
 
Basic
$
0.53

 
$
0.07

 
$
0.28

 
$
0.50

Diluted
$
0.53

 
$
0.07

 
$
0.28

 
$
0.50

Dividends declared per share
$
0.45

 
$
0.45

 
$
0.45

 
$
0.45


 
For the Three Months Ended
 
March 31,
2011
 
June 30,
2011
 
Sept. 30,
2011
 
Dec. 31,
2011
 
(in millions, except per share data)
Total revenues
$
48.4

 
$
90.7

 
$
60.4

 
$
94.5

Total expenses
51.0

 
57.6

 
47.4

 
69.4

Income (loss) before taxes
(2.6
)
 
33.1

 
13.0

 
25.1

Provision (benefit) for taxes
(1.0
)
 
11.6

 
4.4

 
9.0

Net income allocated to common stockholders
$
(1.6
)
 
$
21.5

 
$
8.6

 
$
16.1

Earnings (loss) per share:
 
 
 
 
 
 
 
Basic
$
(0.05
)
 
$
0.69

 
$
0.28

 
$
0.53

Diluted
$
(0.05
)
 
$
0.69

 
$
0.28

 
$
0.53

Dividends declared per share
$
0.45

 
$
0.45

 
$
0.45

 
$
0.45