Consolidated Statements of Stockholders' Equity (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, 2009	$ 2,536.3	$ 525.0	$ 47.1	$ 2,441.0	$ (324.8)	$ (176.6)	$ (14.0)	$ 2,497.7	$ 38.6
Beginning balance, shares at Dec. 31, 2009			486.5
Net income	281.2				261.1			261.1	20.1
Other comprehensive income (loss)	59.5					57.6		57.6	1.9
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
Exercise of stock options, shares	0.5
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
Other, shares			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
Other comprehensive income (loss)	(109.2)					(106.7)		(106.7)	(2.5)
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
Exercise of stock options, shares	1.3		1.3
Exercise of stock options, value	12.0		0.1	11.9				12.0
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
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
Net income	464.6				446.7			446.7	17.9
Other comprehensive income (loss)	(63.4)					(62.3)		(62.3)	(1.1)
Reclassifications related to redeemable noncontrolling interests	10.9			12.0				12.0	(1.1)
Noncontrolling interest transactions	(2.2)								(2.2)
Distributions to noncontrolling interests	(17.0)								(17.0)
Change in redemption value of redeemable noncontrolling interests	2.7				2.7			2.7
Repurchase of common stock	(350.5)						(350.5)	(350.5)
Common stock dividends	(103.4)				(103.4)			(103.4)
Preferred stock dividends	(11.6)				(11.6)			(11.6)
Stock-based compensation, shares			1.6
Stock-based compensation, value	32.0		0.7	31.3				32.0
Exercise of stock options, shares	1.2		1.1
Exercise of stock options, value	10.9		0.1	10.8				10.9
Shares withheld for taxes, shares			(2.1)
Shares withheld for taxes, value	(23.7)		(0.2)	(23.5)				(23.7)
Tax effect from stock-based compensation	14.8			14.8				14.8
Other	(4.8)			(7.5)	(1.2)			(8.7)	3.9
Ending balance at Dec. 31, 2012	$ 2,456.6	$ 221.5	$ 48.8	$ 2,465.4	$ 738.3	$ (288.0)	$ (765.4)	$ 2,420.6	$ 36.0
Ending balance, shares at Dec. 31, 2012			492.0