Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
REVENUE:
Net revenue	$ 1,853.4	$ 2,125.9	$ 3,825.5	$ 4,130.7
Billable expenses	172.3	394.3	560.0	750.7
Total revenue	2,025.7	2,520.2	4,385.5	4,881.4
OPERATING EXPENSES:
Salaries and related expenses	1,306.1	1,381.2	2,728.9	2,802.3
Office and other direct expenses	317.0	387.3	695.2	776.5
Billable expenses	172.3	394.3	560.0	750.7
Cost of services	1,795.4	2,162.8	3,984.1	4,329.5
Selling, general and administrative expenses	4.1	18.1	26.5	59.5
Depreciation and amortization	73.1	73.0	145.9	144.1
Restructuring charges	112.6	2.1	112.6	33.9
Total operating expenses	1,985.2	2,256.0	4,269.1	4,567.0
OPERATING INCOME	40.5	264.2	116.4	314.4
EXPENSES AND OTHER INCOME:
Interest expense	(49.8)	(51.6)	(94.6)	(101.4)
Interest income	5.9	7.7	16.6	15.5
Other Nonoperating Income (Expense)	(21.5)	(3.8)	(43.3)	(10.7)
Total (expenses) and other income	(65.4)	(47.7)	(121.3)	(96.6)
Income before income taxes	(24.9)	216.5	(4.9)	217.8
Provision for income taxes	19.0	43.6	36.2	54.1
Income of consolidated companies	(43.9)	172.9	(41.1)	163.7
Equity in net income (loss) of unconsolidated affiliates	0.0	(0.1)	(0.2)	(0.4)
NET INCOME	(43.9)	172.8	(41.3)	163.3
Net income attributable to noncontrolling interests	(1.7)	(3.3)	0.4	(1.8)
NET INCOME AVAILABLE TO IPG COMMON STOCKHOLDERS	$ (45.6)	$ 169.5	$ (40.9)	$ 161.5
Earnings per share, Basic	$ (0.12)	$ 0.44	$ (0.11)	$ 0.42
Earnings per share, Diluted	$ (0.12)	$ 0.43	$ (0.11)	$ 0.41
Weighted-average number of common shares outstanding, Basic	389.4	386.2	388.5	385.4
Weighted-average number of common shares outstanding, Diluted	389.4	391.2	388.5	390.1