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Earnings Per Share (Tables)
3 Months Ended
Mar. 31, 2021
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The following sets forth basic and diluted earnings per common share available to IPG common stockholders.
Three Months Ended March 31,
20212020
Net income available to IPG common stockholders$91.7 $4.7 
Weighted-average number of common shares outstanding - basic391.5 387.7 
       Dilutive effect of stock options and restricted shares4.54.0
Weighted-average number of common shares outstanding - diluted396.0 391.7 
Earnings per share available to IPG common stockholders:
       Basic$0.23 $0.01 
       Diluted$0.23 $0.01