Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Statement of Comprehensive Income [Abstract]
NET INCOME	$ 288.9		$ 464.6	$ 551.5
Other Comprehensive Income
Foreign currency translation adjustments, before tax	(116.9)		9.7	(92.1)
Foreign currency translation adjustments, income tax effect	(0.6)		0	0
Foreign currency translation adjustments, net of tax	(117.5)		9.7	(92.1)
Available-for-sale securities:
Changes in market value of available-for-sale securities	0.8		0.4	(0.1)
Less: recognition of previously unrealized losses (gains) included in net income	(1.4)		0.7	0.3
Available-for-sale securities, Income tax effect	0.2		(0.5)	0
Available-for-sale securities, Net of tax	(0.4)		0.6	0.2
Derivatives instruments:
Changes in fair value of derivative instruments	0		(21.9)	0
Less: recognition of previously unrealized losses included in net income	1.7		0.3	0
Derivative instruments, Income tax effect	(0.7)		8.9	0
Derivative instruments, Net of tax	1.0		(12.7)	0
Defined benefit pension and other postretirement plans:
Net actuarial losses for the period	(20.6)		(67.9)	(25.7)
Less: amortization of unrecognized losses, transition obligation and prior service cost included in net income	10.8	[1]	7.7	7.5
Less: settlement and curtailment (gains) losses included in net income	(0.1)		0.7	0
Other	1.0		(3.4)	2.4
Defined benefit pension and other postretirement plans, Income tax effect	(1.3)		1.9	(1.5)
Defined benefit pension and other postretirement plans, Net of tax	(10.2)		(61.0)	(17.3)
Other comprehensive loss, net of tax	(127.1)		(63.4)	(109.2)
Total comprehensive income	161.8		401.2	442.3
Less: comprehensive income attributable to noncontrolling interest	17.1		16.8	16.7
Comprehensive Income Attributable to IPG	$ 144.7		$ 384.4	$ 425.6

[1] 1 These accumulated other comprehensive loss components are included in the computation of net periodic cost. See Note 13 for further information