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Net Income Per Share (Tables)
 12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Net Income Per Share
Basic and diluted net income per share are calculated using the treasury stock method.
 
2019
 
2018
 
2017
Basic
 
 
 
 
 
     Average shares outstanding
91,803,528

 
92,992,457

 
92,908,638

 
 
 
 
 
 
     Net income:
 
 
 
 
 
Continuing operations
$
1,541.3

 
$
1,108.7

 
$
1,769.5

Discontinued operations


 


 
(41.6
)
Net income
$
1,541.3

 
$
1,108.7

 
$
1,727.9

 
 
 
 
 
 
Basic net income per share:
 
 
 
 
 
Continuing operations
$
16.79

 
$
11.92

 
$
19.04

Discontinued operations


 


 
(0.44
)
Net income per share
$
16.79

 
$
11.92

 
$
18.60

 
 
 
 
 
 
Diluted
 
 
 
 
 
Average shares outstanding
91,803,528

 
92,992,457

 
92,908,638

Stock options and other contingently issuable shares (1)
1,601,213

 
1,938,586

 
1,931,157

Non-vested restricted stock grants
42,101

 
57,027

 
87,418

Average shares outstanding assuming dilution
93,446,842

 
94,988,070

 
94,927,213

 
 
 
 
 
 
Net income:
 
 
 
 
 
Continuing operations
$
1,541.3

 
$
1,108.7

 
$
1,769.5

Discontinued operations


 


 
(41.6
)
Net income
$
1,541.3

 
$
1,108.7

 
$
1,727.9

 
 
 
 
 
 
Diluted net income per share:
 
 
 
 
 
Continuing operations
$
16.49

 
$
11.67

 
$
18.64

Discontinued operations


 


 
(0.44
)
Net income per share
$
16.49

 
$
11.67

 
$
18.20

(1) 
Stock options and other contingently issuable shares excludes 449,167, 28,321 and 638,795 shares at December 31, 2019, 2018 and 2017, respectively, due to their anti-dilutive effect.