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Results by Quarter (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]                      
Net revenue $ 2,284.4 $ 1,954.6 $ 1,853.4 $ 1,972.1 $ 2,433.0 $ 2,061.4 $ 2,125.9 $ 2,004.8 $ 8,064.5 $ 8,625.1 $ 8,031.6
Billable expenses 265.6 170.9 172.3 387.7 468.8 376.7 394.3 356.4 996.5 1,596.2 1,682.8
Total revenue 2,550.0 2,125.5 2,025.7 2,359.8 2,901.8 2,438.1 2,520.2 2,361.2 9,061.0 10,221.3 9,714.4
Salaries and related expenses 1,346.2 1,269.9 1,306.1 1,422.8 1,432.1 1,334.4 1,381.2 1,421.1 5,345.0 5,568.8 5,298.3
Office and other direct expenses 364.8 307.9 317.0 378.2 419.7 367.9 387.3 389.2 1,367.9 1,564.1 1,355.1
Billable expense 265.6 170.9 172.3 387.7 468.8 376.7 394.3 356.4 996.5 1,596.2 1,682.8
Cost of services 1,976.6 1,748.7 1,795.4 2,188.7 2,320.6 2,079.0 2,162.8 2,166.7 7,709.4 8,729.1 8,336.2
Depreciation and amortization 73.7 71.0 73.1 72.8 65.4 69.0 73.0 71.1 290.6 278.5 202.9
Restructuring Charges 253.9 47.3 112.6 0.0 0.0 0.0 2.1 31.8 413.8 33.9 0.0
Total operating expenses 2,326.6 1,876.9 1,985.2 2,283.9 2,410.5 2,157.8 2,256.0 2,311.0 8,472.6 9,135.3 8,705.6
Operating Income (Loss) 223.4 248.6 40.5 75.9 491.3 280.3 264.2 50.2 588.4 1,086.0 1,008.8
Interest Income (Expense), Nonoperating, Net (40.0) (44.7) (43.9) (34.1) (38.7) (40.2) (43.9) (42.0)      
Net losses on sales of businesses 15.2 8.6 19.9 23.3 23.9 7.7 3.2 8.6 (67.0) (43.4) (61.9)
Tax Adjustments, Settlements, and Unusual Provisions   136.2         13.9   (136.2) 0.0 0.0
reversal of valuation allowance         25.3            
Total (expenses) and other income (49.8) (56.0) (65.4) (55.9) (63.5) (47.6) (47.7) (48.9) (227.1) (207.7) (170.8)
Various Discrete Tax Items   (3.2) (10.4)                
NET INCOME 117.0 278.5 (43.9) 2.6 342.2 168.4 172.8 (9.5) $ 354.2 $ 673.9 $ 637.7
Net income available to IPG common stockholders $ 112.3 $ 279.7 $ (45.6) $ 4.7 $ 328.9 $ 165.6 $ 169.5 $ (8.0)      
Earnings per share, Basic $ 0.29 $ 0.72 $ (0.12) $ 0.01 $ 0.85 $ 0.43 $ 0.44 $ (0.02) $ 0.90 $ 1.70 $ 1.61
Earnings per share, Diluted 0.28 0.71 (0.12) 0.01 0.84 0.42 0.43 (0.02) $ 0.89 $ 1.68 $ 1.59
Dividends declared per common share $ 0.255 $ 0.255 $ 0.255 $ 0.255 $ 0.235 $ 0.235 $ 0.235 $ 0.235