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Earnings Per Share (Tables)
9 Months Ended
Sep. 30, 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 September 30,Nine Months Ended
September 30,
2021202020212020
Net income available to IPG common stockholders$239.9 $279.7 $594.9 $238.8 
Weighted-average number of common shares outstanding - basic393.5 389.6 392.8388.9
       Dilutive effect of stock options and restricted shares6.3 4.35.5 3.7
Weighted-average number of common shares outstanding - diluted399.8 393.9 398.3392.6
Earnings per share available to IPG common stockholders:
       Basic$0.61 $0.72 $1.51 $0.61 
       Diluted$0.60 $0.71 $1.49 $0.61