Consolidated Statements of Stockholders' Equity and Comprehensive Income (USD $) In Millions	Total	Preferred Stock	Common Stock	Additional Paid-In Capital	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Loss, Net of Tax	Treasury Stock	Total IPG Stockholders' Equity	Noncontrolling Interests
Beginning balance at Dec. 31, 2008	$ 2,244.2	$ 525.0	$ 46.4	$ 2,413.5	$ (446.1)	$ (318.5)	$ (14.0)	$ 2,206.3	$ 37.9
Beginning balance, shares at Dec. 31, 2008			477.1
Net income	143.4				121.3			121.3	22.1
Foreign currency translation adjustments, net of tax	131.2					128.9		128.9	2.3
Changes in market value of securities available-for-sale, net of tax	0.5					0.5		0.5
Recognition of previously unrealized loss on securities available-for-sale, net of tax	(0.4)					(0.4)		(0.4)
Unrecognized losses, transition obligation and prior service cost, net of tax	12.9					12.9		12.9
Total comprehensive income	287.6							263.2	24.4
Reclassifications related to redeemable noncontrolling interests	8.0			10.5				10.5	(2.5)
Noncontrolling interest transactions	(5.3)			(5.4)				(5.4)	0.1
Distributions to noncontrolling interests	(22.2)								(22.2)
Change in redemption value of redeemable noncontrolling interests	12.0			12.0				12.0
Preferred stock dividends	(27.6)			(27.6)				(27.6)
Stock-based compensation, shares			12.8
Stock-based compensation, value	55.1		1.0	54.1				55.1
Shares withheld for taxes, shares			(3.4)
Shares withheld for taxes, value	(17.1)		(0.3)	(16.8)				(17.1)
Exercise of stock options, shares	0
Other	1.6			0.7				0.7	0.9
Ending balance at Dec. 31, 2009	2,536.3	525.0	47.1	2,441.0	(324.8)	(176.6)	(14.0)	2,497.7	38.6
Ending balance, shares at Dec. 31, 2009			486.5
Net income	281.2				261.1			261.1	20.1
Foreign currency translation adjustments, net of tax	35.9					34.0		34.0	1.9
Changes in market value of securities available-for-sale, net of tax	0.6					0.6		0.6
Recognition of previously unrealized loss on securities available-for-sale, net of tax	(0.2)					(0.2)		(0.2)
Unrecognized losses, transition obligation and prior service cost, net of tax	23.2					23.2		23.2
Total comprehensive income	340.7							318.7	22.0
Reclassifications related to redeemable noncontrolling interests	2.0			3.5				3.5	(1.5)
Noncontrolling interest transactions	(27.9)			(28.1)				(28.1)	0.2
Distributions to noncontrolling interests	(21.5)								(21.5)
Change in redemption value of redeemable noncontrolling interests	(11.0)			(11.0)				(11.0)
Repurchase of preferred stock	(267.6)	(303.5)		(35.9)				(267.6)
Capped Call Transaction Costs	(22.8)			(22.8)				(22.8)
Preferred stock dividends	(15.6)			(15.6)				(15.6)
Stock-based compensation, shares			2.7
Stock-based compensation, value	55.8		0.4	55.4				55.8
Shares withheld for taxes, shares			(0.2)
Shares withheld for taxes, value	(11.9)		(0.1)	(11.8)				(11.9)
Tax effect from stock-based compensation	4.5			4.5				4.5
Exercise of stock options, shares	0.5		0.5
Other	5.9		0.1	5.8			(0.1)	5.8	0.1
Ending balance at Dec. 31, 2010	2,566.9	221.5	47.5	2,456.8	(63.7)	(119.0)	(14.1)	2,529.0	37.9
Ending balance, shares at Dec. 31, 2010			489.5
Net income	551.5				532.3			532.3	19.2
Foreign currency translation adjustments, net of tax	(92.1)					(89.6)		(89.6)	(2.5)
Changes in market value of securities available-for-sale, net of tax	(0.1)					(0.1)		(0.1)
Recognition of previously unrealized loss on securities available-for-sale, net of tax	0.3					0.3		0.3
Unrecognized losses, transition obligation and prior service cost, net of tax	(17.3)					(17.3)		(17.3)
Total comprehensive income	442.3							425.6	16.7
Reclassifications related to redeemable noncontrolling interests	10.4			2.7				2.7	7.7
Noncontrolling interest transactions	(1.6)			0.4	0.6			1.0	(2.6)
Distributions to noncontrolling interests	(23.0)								(23.0)
Change in redemption value of redeemable noncontrolling interests	(14.1)			(10.6)	(3.5)			(14.1)
Repurchase of common stock	(400.8)						(400.8)	(400.8)
Common stock dividends	(111.1)			(56.8)	(54.3)			(111.1)
Preferred stock dividends	(11.6)			(5.8)	(5.8)			(11.6)
Stock-based compensation, shares			1.5
Stock-based compensation, value	48.7		0.8	47.9				48.7
Shares withheld for taxes, shares			(0.9)
Shares withheld for taxes, value	(27.0)		(0.2)	(26.8)				(27.0)
Tax effect from stock-based compensation	8.4			8.4				8.4
Exercise of stock options, shares	1.3		1.3
Exercise of stock options, value	12.0		0.1	11.9				12.0
Other	(2.2)			(0.6)	(0.5)			(1.1)	(1.1)
Ending balance at Dec. 31, 2011	$ 2,497.3	$ 221.5	$ 48.2	$ 2,427.5	$ 405.1	$ (225.7)	$ (414.9)	$ 2,461.7	$ 35.6
Ending balance, shares at Dec. 31, 2011			491.4