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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2012
Earnings Per Share [Abstract]  
Schedule Of Calculation Of Basic And Diluted Earnings Per Share
The calculation of basic and diluted earnings per share is as follows (in millions, except per share data):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2012
 
2011
 
2012
 
2011
Numerator for basic and diluted earnings per share:
 
 
 
 
 
 
 
Income (loss) from continuing operations
$
106.6

 
$
(166.4
)
 
$
297.7

 
$
52.9

Income (loss) from discontinued operations
1.7

 
(11.2
)
 
1.7

 
(8.1
)
Net income (loss)
$
108.3

 
$
(177.6
)
 
$
299.4

 
$
44.8

Dividends and equivalents for share-based awards expected to be forfeited
—

 
—

 
—

 
0.1

Net income (loss) for basic earnings per share
$
108.3

 
$
(177.6
)
 
$
299.4

 
$
44.9

Effect of Preferred Securities (1)
—

 
—

 
—

 
—

Net income (loss) for diluted earnings per share
$
108.3

 
$
(177.6
)
 
$
299.4

 
$
44.9

Denominator for basic and diluted earnings per share:
 
 
 
 
 
 
 
Weighted-average shares outstanding
288.0

 
290.8

 
288.9

 
291.1

Share-based payment awards classified as participating securities (2)
2.7

 
—

 
2.8

 
3.1

Denominator for basic earnings per share
290.7

 
290.8

 
291.7

 
294.2

Dilutive securities (3)
2.0

 
—

 
2.1

 
2.3

Convertible Notes (4)
—

 
—

 
—

 
0.3

Preferred Securities (1)
—

 
—

 
—

 
—

Denominator for diluted earnings per share
292.7

 
290.8

 
293.8

 
296.8

Basic earnings per share:
 
 
 
 
 
 
 
Income (loss) from continuing operations
$
0.37

 
$
(0.57
)
 
$
1.02

 
$
0.18

Income (loss) from discontinued operations
0.01

 
(0.04
)
 
0.01

 
(0.03
)
Net income (loss)
$
0.37

 
$
(0.61
)
 
$
1.03

 
$
0.15

Diluted earnings per share:
 
 
 
 
 
 
 
Income (loss) from continuing operations
$
0.36

 
$
(0.57
)
 
$
1.01

 
$
0.18

Income (loss) from discontinued operations
0.01

 
(0.04
)
 
0.01

 
(0.03
)
Net income (loss)
$
0.37

 
$
(0.61
)
 
$
1.02

 
$
0.15