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Quarterly Financial Information
 12 Months Ended
Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Information
Quarterly Financial Information (Unaudited)
The following is a summary of unaudited quarterly financial data for the years ended December 31, 2012 and 2011:
 
2012
 
Dec. 31,
 
Sept. 30,
 
Jun. 30,
 
Mar. 31,
 
(in millions, except per share data)
Revenues
$
301.6

 
$
304.2

 
$
298.3

 
$
293.0

Operating income
11.9

 
33.0

 
38.8

 
43.5

Income (loss) from continuing operations
(42.0
)
 
6.8

 
12.9

 
(0.3
)
Loss from discontinued operations, net of taxes
(0.4
)
 
(7.1
)
 
(1.0
)
 
(0.7
)
Net income (loss)
$
(42.4
)
 
$
(0.3
)
 
$
12.0

 
$
(1.0
)
Per Share Data—Basic (a)
 
 
 
 
 
 
 
Income (loss) from continuing operations
$
(0.71
)
 
$
0.11

 
$
0.21

 
$
(0.01
)
Income (loss) from discontinued operations, net of taxes
(0.01
)
 
(0.12
)
 
(0.02
)
 
(0.01
)
Net income (loss)—basic
$
(0.72
)
 
$
(0.01
)
 
$
0.19

 
$
(0.02
)
Per Share Data—Diluted (a)
 
 
 
 
 
 
 
Income (loss) from continuing operations
$
(0.71
)
 
$
0.10

 
$
0.21

 
$
(0.01
)
Income (loss) from discontinued operations, net of taxes
(0.01
)
 
(0.11
)
 
(0.02
)
 
(0.01
)
Net income (loss)—diluted
$
(0.72
)
 
$
(0.01
)
 
$
0.19

 
$
(0.02
)
 
2011
 
Dec. 31,
 
Sept. 30,
 
Jun. 30,
 
Mar. 31,
 
(in millions, except per share data)
Revenues
$
275.8

 
$
295.9

 
$
289.4

 
$
280.1

Operating income
37.1

 
37.5

 
22.0

 
32.1

Income (loss) from continuing operations
17.7

 
11.8

 
(5.2
)
 
5.9

Income (loss) from discontinued operations, net of taxes
7.3

 
(12.6
)
 
(23.9
)
 
(3.6
)
Net income (loss)
$
25.0

 
$
(0.8
)
 
$
(29.1
)
 
$
2.4

Per Share Data—Basic (a)
 
 
 
 
 
 
 
Income (loss) from continuing operations
$
0.28

 
$
0.19

 
$
(0.08
)
 
$
0.10

Income (loss) from discontinued operations, net of taxes
0.12

 
(0.20
)
 
(0.39
)
 
(0.06
)
Net income (loss)—basic
$
0.40

 
$
(0.01
)
 
$
(0.47
)
 
$
0.04

Per Share Data—Diluted (a)
 
 
 
 
 
 
 
Income (loss) from continuing operations
$
0.28

 
$
0.19

 
$
(0.08
)
 
$
0.10

Income (loss) from discontinued operations, net of taxes
0.12

 
(0.20
)
 
(0.39
)
 
(0.06
)
Net income (loss)—diluted
$
0.40

 
$
(0.01
)
 
$
(0.47
)
 
$
0.04

(a)
Net income (loss) per share calculations for each quarter is based on the weighted average number of shares outstanding during the respective periods; accordingly, the sum of the quarters may not equal the full-year income (loss) per share.