Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenue
Revenue	$ 1,876.1	$ 1,851.4	$ 3,552.1	$ 3,488.9
Operating Expenses:
Salaries and related expenses	1,205.2	1,170.2	2,420.4	2,358.8
Office and general expenses	455.1	485.4	908.1	946.0
Total operating expenses	1,660.3	1,655.6	3,328.5	3,304.8
OPERATING INCOME	215.8	195.8	223.6	184.1
Expenses and Other Income:
Interest expense	(20.3)	(22.6)	(41.2)	(42.8)
Interest income	5.0	6.6	12.2	12.8
Other Nonoperating Income (Expense)	0.5	(11.2)	0.8	(9.5)
Total (expenses) and other income	(14.8)	(27.2)	(28.2)	(39.5)
Income before income taxes	201.0	168.6	195.4	144.6
Provision for income taxes	77.7	65.3	76.3	63.6
Income of consolidated companies	123.3	103.3	119.1	81.0
Equity in net income of unconsolidated affiliates	0.5	0.4	0.5	0.3
NET INCOME	123.8	103.7	119.6	81.3
Net income attributable to noncontrolling interests	(2.6)	(4.3)	(0.2)	(2.8)
NET INCOME AVAILABLE TO IPG COMMON STOCKHOLDERS	$ 121.2	$ 99.4	$ 119.4	$ 78.5
Earnings Per Share, Basic	$ 0.30	$ 0.24	$ 0.29	$ 0.19
Earnings Per Share, Diluted	$ 0.29	$ 0.23	$ 0.29	$ 0.18
Weighted Average Number of Shares Outstanding, Basic	410.5	421.1	410.8	421.9
Weighted Average Number of Shares Outstanding, Diluted	417.6	428.1	417.6	428.5
Dividends declared per common share	$ 0.120	$ 0.095	$ 0.240	$ 0.190