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Earnings Per Share Basic and Diluted Earnings Per Common Share Available to IPG Common Stockholders (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Basic and Diluted Earnings Per Common Share Available to IPG Common Stockholders
The following sets forth basic and diluted earnings per common share available to IPG common stockholders.
 
Years ended December 31,
 
2018
 
2017
 
2016
Net income available to IPG common stockholders
$
618.9

 
$
554.4

 
$
605.0

 
 
 
 
 
 
Weighted-average number of common shares outstanding - basic
383.3

 
389.6

 
397.9

Dilutive effect of stock options and restricted shares
5.7

 
7.7

 
10.1

Weighted-average number of common shares outstanding - diluted
389.0

 
397.3

 
408.0

 
 
 
 
 
 
Earnings per share available to IPG common stockholders:
 
 
 
 
 
Basic
$
1.61

 
$
1.42

 
$
1.52

Diluted
$
1.59

 
$
1.40

 
$
1.48