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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings Per Share [Abstract]        
Net income available to IPG common stockholders $ 239.9 $ 279.7 $ 594.9 $ 238.8
Weighted-average number of common shares outstanding, Basic 393.5 389.6 392.8 388.9
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 6.3 4.3 5.5 3.7
Weighted-average number of common shares outstanding, Diluted 399.8 393.9 398.3 392.6
Earnings per share, Basic $ 0.61 $ 0.72 $ 1.51 $ 0.61
Earnings per share, Diluted $ 0.60 $ 0.71 $ 1.49 $ 0.61