Earnings Per Share Basic and Diluted Earnings Per Common Share Available to IPG Common Stockholders (Tables)

12 Months Ended

Dec. 31, 2017

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,
	2017		2016		2015
Net income available to IPG common stockholders	$	579.0	$	608.5	$	454.6
Weighted-average number of common shares outstanding - basic	389.6		397.9		408.1
Dilutive effect of stock options and restricted shares	7.7		10.1		7.6
Weighted-average number of common shares outstanding - diluted	397.3		408.0		415.7
Earnings per share available to IPG common stockholders:
Basic	$	1.49	$	1.53	$	1.11
Diluted	$	1.46	$	1.49	$	1.09