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Earnings (Loss) Per Share (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Basic and Diluted EPS
The following table presents the calculation of basic and diluted EPS:
 
2017
 
2016
 
2015
Net income from continuing operations
$
435.0

 
$
431.7

 
$
443.7

Loss from discontinued operations, net of income taxes
(0.4
)
 
(1.2
)
 
(1.1
)
Net income
$
434.6

 
$
430.5

 
$
442.6

 
 
 
 
 
 
Weighted average common shares outstanding used in calculating basic EPS
97.8

 
103.1

 
112.7

Effect of dilutive stock options
0.4

 
0.7

 
1.2

Weighted average common shares outstanding used in calculating diluted EPS
98.2

 
103.8

 
113.9

 
 
 
 
 
 
Basic EPS amounts(1):
 
 
 
 
 
Continuing operations
$
4.45

 
$
4.19

 
$
3.94

Discontinued operations
$
—

 
$
(0.01
)
 
$
(0.01
)
Net income
$
4.44

 
$
4.18

 
$
3.93

 
 
 
 
 
 
Diluted EPS amounts(1):
 
 
 
 
 
Continuing operations
$
4.43

 
$
4.16

 
$
3.90

Discontinued operations
$
—

 
$
(0.01
)
 
$
(0.01
)
Net income
$
4.43

 
$
4.15

 
$
3.89

(1) Earnings per share amounts are calculated discretely and therefore may not add up to the total due to rounding.
Anti-Dilutive Options Excluded From The Computation Of Diluted Earnings Per Share
A summary of anti-dilutive equity instruments excluded from the computation of diluted earnings per share is as follows:
 
2017
 
2016
 
2015
Anti-dilutive equity instruments excluded from the computation of diluted earnings per share
3.1

 
3.0

 
0.7