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Earnings Per Share (Notes)
6 Months Ended
Jun. 30, 2022
Earnings Per Share [Abstract]  
Earnings Per Share [Text Block] Earnings Per Share
The following sets forth basic and diluted earnings per common share available to IPG common stockholders.
Three Months Ended June 30,Six Months Ended June 30,
2022202120222021
Net income available to IPG common stockholders$229.6 $263.3 $389.0 $355.0 
Weighted-average number of common shares outstanding - basic393.1 393.3 393.8392.4
       Dilutive effect of stock options and restricted shares3.7 5.7 3.7 5.2
Weighted-average number of common shares outstanding - diluted396.8 399.0 397.5397.6
Earnings per share available to IPG common stockholders:
       Basic$0.58 $0.67 $0.99 $0.90 
       Diluted$0.58 $0.66 $0.98 $0.89