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Earnings per Share (Tables)
 12 Months Ended
Dec. 31, 2015
Earnings Per Share [Abstract]  
Computations of basic and diluted loss per share for Loss from Continuing Operations
The computations of basic and diluted earnings per share for Income from continuing operations were as follows (in millions, except per share data):
 
 
For the Years Ended December 31,
 
2015
 
2014
 
2013
Net income
$
186.6

 
$
205.8

 
$
171.8

Add: Loss from discontinued operations
0.6

 
2.3

 
8.1

Income from continuing operations
$
187.2

 
$
208.1

 
$
179.9

 
 
 
 
 
 
Weighted-average shares outstanding – basic
44.9

 
47.9

 
49.8

Add: Potential effect of diluted securities attributable to stock-based payments
0.7

 
0.7

 
0.8

Weighted-average shares outstanding – diluted
45.6

 
48.6

 
50.6

 
 
 
 
 
 
Earnings per share - Basic:
 
 
 
 
 
Income from continuing operations
$
4.17

 
$
4.35

 
$
3.61

Loss from discontinued operations
(0.01
)
 
(0.05
)
 
(0.16
)
Net income
$
4.16

 
$
4.30

 
$
3.45

 
 
 
 
 
 
Earnings per share - Diluted:
 
 
 
 
 
Income from continuing operations
$
4.11

 
$
4.28

 
$
3.55

Loss from discontinued operations
(0.02
)
 
(0.05
)
 
(0.16
)
Net income
$
4.09

 
$
4.23

 
$
3.39
Stock appreciation rights were outstanding, but not included in the diluted loss per share calculation
The following stock appreciation rights were outstanding but not included in the diluted earnings per share calculation because the assumed exercise of such rights would have been anti-dilutive (in millions, except for per share data):
 
For the Years Ended December 31,
 
2015
 
2014
 
2013
Weighted-average number of shares
—

 
0.3

 
0.1

Price ranges per share
$
—

 
$81.11 - $92.64

 
$81.11 - $81.14