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Earnings per Share (Tables)
 12 Months Ended
Dec. 31, 2018
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,
 
2018
 
2017
 
2016
Net income
$
359.0

 
$
305.7

 
$
277.8

Add: Loss from discontinued operations
1.3

 
1.4

 
0.8

Income from continuing operations
$
360.3

 
$
307.1

 
$
278.6

 
 
 
 
 
 
Weighted-average shares outstanding – basic
40.6

 
42.2

 
43.4

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

 
0.6

 
0.6

Weighted-average shares outstanding – diluted
41.1

 
42.8

 
44.0

 
 
 
 
 
 
Earnings per share - Basic:
 
 
 
 
 
Income from continuing operations
$
8.87

 
$
7.28

 
$
6.41

Loss from discontinued operations
(0.03
)
 
(0.03
)
 
(0.02
)
Net income
$
8.84

 
$
7.25

 
$
6.39

 
 
 
 
 
 
Earnings per share - Diluted:
 
 
 
 
 
Income from continuing operations
$
8.77

 
$
7.17

 
$
6.34

Loss from discontinued operations
(0.03
)
 
(0.03
)
 
(0.02
)
Net income
$
8.74

 
$
7.14

 
$
6.32