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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Earnings Per Share [Abstract]        
Net income available to IPG common stockholders $ 263.3 $ (45.6) $ 355.0 $ (40.9)
Weighted-average number of common shares outstanding, Basic 393.3 389.4 392.4 388.5
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 5.7   5.2  
Weighted-average number of common shares outstanding, Diluted 399.0 389.4 397.6 388.5
Earnings per share, Basic $ 0.67 $ (0.12) $ 0.90 $ (0.11)
Earnings per share, Diluted $ 0.66 $ (0.12) $ 0.89 $ (0.11)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount   2.9   3.3