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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2016
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 Net income were as follows (in millions, except per share data):
 
For the Three Months Ended June 30,
 
For the Six Months Ended June 30,
 
2016
 
2015
 
2016
 
2015
Net income
$
110.7

 
$
81.2

 
$
135.6

 
$
95.1

Add: Loss from discontinued operations
0.5

 
0.4

 
0.5

 
0.5

Income from continuing operations
$
111.2

 
$
81.6

 
$
136.1

 
$
95.6

 
 
 
 
 
 
 
 
Weighted-average shares outstanding – basic
43.6

 
45.0

 
43.8

 
44.9

Add: Potential effect of dilutive securities attributable to stock-based payments
0.5

 
0.6

 
0.6

 
0.7

Weighted-average shares outstanding – diluted
44.1

 
45.6

 
44.4

 
45.6

 
 
 
 
 
 
 
 
Earnings per share – Basic:
 
 
 
 
 
 
 
Income from continuing operations
$
2.55

 
$
1.81

 
$
3.11

 
$
2.13

Loss from discontinued operations
(0.01
)
 
(0.01
)
 
(0.01
)
 
(0.01
)
Net income
$
2.54

 
$
1.80

 
$
3.10

 
$
2.12

 
 
 
 
 
 
 
 
Earnings per share – Diluted:
 
 
 
 
 
 
 
Income from continuing operations
$
2.52

 
$
1.79

 
$
3.07

 
$
2.10

Loss from discontinued operations
(0.01
)
 
(0.01
)
 
(0.01
)
 
(0.01
)
Net income
$2.51
 
$
1.78

 
$
3.06

 
$
2.09
Stock appreciation rights were outstanding, but not included in the diluted loss per share calculation
The following stock appreciation rights and restricted stock units 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 Three Months Ended June 30,
 
For the Six Months Ended June 30,
 
2016
 
2015
 
2016
 
2015
Weighted-average number of shares
0.2

 
0.2

 
0.2

 
0.2

Price range per share
$124.97-$131.94

 
$
92.64

 
$124.97-$131.94

 
$
92.64