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Earnings per Share (EPS) (Tables)
 3 Months Ended
Mar. 31, 2012
Earnings Per Share [Abstract]  
Earnings allocation method utilized in the calculation of basic and diluted EPS
The following illustrates the earnings allocation method utilized in the calculation of basic and diluted EPS:
 
Three Months Ended March 31,
 
2012
 
2011
 
(In millions, except per share amounts)
EPS numerator:
 
 
 
Income from continuing operations, net of income taxes
$
182.3

 
$
194.6

Less: Net income attributable to noncontrolling interests
5.6

 
2.2

Income from continuing operations attributable to common stockholders,
   before allocation of earnings to participating securities
   
176.7

 
192.4

Less: Earnings allocated to participating securities
(1.2
)
 
(0.9
)
Income from continuing operations attributable to common stockholders,
   after earnings allocated to participating securities (1)   
175.5

 
191.5

Loss from discontinued operations, net of income taxes
(4.0
)
 
(15.9
)
Net income attributable to common stockholders, after
   earnings allocated to participating securities (1)
$
171.5

 
$
175.6

 
 
 
 
EPS denominator:
 
 
 
Weighted average shares outstanding — basic
270.1

 
268.9

Impact of dilutive securities
0.8

 
3.9

Weighted average shares outstanding — diluted
270.9

 
272.8

 
 
 
 
Basic EPS attributable to common stockholders:
 
 
 
Income from continuing operations
$
0.64

 
$
0.71

Loss from discontinued operations
(0.01
)
 
(0.05
)
Net income
$
0.63

 
$
0.66

 
 
 
 
Diluted EPS attributable to common stockholders:
 
 
 
Income from continuing operations
$
0.64

 
$
0.70

Loss from discontinued operations
(0.01
)
 
(0.05
)
Net income
$
0.63

 
$
0.65

(1) 
The reallocation adjustment for participating securities to arrive at the numerator used to calculate diluted EPS was less than $0.1 million for the periods presented