Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
REVENUE:
Net revenue	$ 2,309.0	$ 2,296.2	$ 6,814.4	$ 6,898.9
Billable expenses	369.5	341.5	1,051.6	1,043.0
Total revenue	2,678.5	2,637.7	7,866.0	7,941.9
OPERATING EXPENSES:
Salaries and related expenses	1,531.1	1,546.8	4,707.0	4,701.4
Office and other direct expenses	318.8	327.9	989.6	1,001.1
Billable expenses	369.5	341.5	1,051.6	1,043.0
Cost of services	2,219.4	2,216.2	6,748.2	6,745.5
Selling, general and administrative expenses	16.9	18.5	43.7	57.2
Depreciation and amortization	66.0	67.0	199.0	201.9
Restructuring charges	(0.6)	(5.8)	(0.7)	0.7
Total operating expenses	2,301.7	2,295.9	6,990.2	7,005.3
OPERATING INCOME	376.8	341.8	875.8	936.6
EXPENSES AND OTHER INCOME:
Interest expense	(58.7)	(42.6)	(164.2)	(121.2)
Interest income	35.1	14.7	97.3	33.9
Other (Expense) Income, Net	(13.7)	17.5	(24.8)	6.8
Total (expenses) and other income	(37.3)	(10.4)	(91.7)	(80.5)
Income before income taxes	339.5	331.4	784.1	856.1
Provision for income taxes	91.5	76.4	135.9	209.2
Income of consolidated companies	248.0	255.0	648.2	646.9
Equity in net (loss) income of unconsolidated affiliates	(2.3)	2.5	(1.7)	3.3
NET INCOME	245.7	257.5	646.5	650.2
Net income attributable to noncontrolling interests	(2.0)	(5.7)	(11.3)	(9.4)
NET INCOME AVAILABLE TO IPG COMMON STOCKHOLDERS	$ 243.7	$ 251.8	$ 635.2	$ 640.8
Earnings per share, Basic	$ 0.64	$ 0.64	$ 1.65	$ 1.63
Earnings per share, Diluted	$ 0.63	$ 0.64	$ 1.64	$ 1.62
Weighted-average number of common shares outstanding, Basic	383.6	390.6	385.0	392.7
Weighted-average number of common shares outstanding, Diluted	385.5	394.1	386.8	396.2