Consolidated Statements of Comprehensive Income (Loss) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Net Loss, Before Tax	$ (64.9)	$ (74.7)
Tax (Expense) Benefit	19.2	21.5
Net Loss, Net of Tax	(45.7)	(53.2)
Foreign Currency Translation Adjustments
Foreign currency translation adjustment, Before tax	45.3	43.6
Foreign currency translation adjustments, Tax	(0.2)	0.1
Foreign currency translation adjustments, Net of tax	45.1	43.7
Unrealized Gains on Available-for-Sale Securities
Unrealized gains on available-for sale securities, Before tax	0.5	0.6
Unrealized gains on available-for sale securities, Tax	0	(0.1)
Unrealized gains on available-for sale securities, Net of tax	0.5	0.5
Less: recognition of previously unrealized gains included in net loss, Before tax	0.6	0
Less: recognition of previously unrealized gains included in net loss,, Tax	0	0
Less: recognition of previously unrealized gains included in net loss,, Net of tax	0.6	0
Changes in market value of available-for-sale securities, Before Tax	1.1	0.6
Changes in market value of available-for-sale securities, Tax	0	(0.1)
Changes in market value of available-for-sale securities, Net of tax	1.1	0.5
Unrealized Losses on Derivative Instruments
Changes in fair value of derivative instruments, Before tax	(2.8)	0
Changes in fair value of derivative instruments, Tax	0	0
Changes in fair value of derivative instruments, Net of tax	(2.8)	0
Unrecognized Losses, Transition Obligation and Prior Service Cost
Net loss for the period, Before tax	(0.3)	0
Net loss for the period, Tax	0.1	0
Net loss for the period, Net of tax	(0.2)	0
Less: amortization of unrecognized losses, transition obligation and prior service cost included in net loss, Before tax	1.9	1.9
Less: amortization of unrecognized losses, transition obligation and prior service cost included in net loss, Tax	(0.6)	(0.7)
Less: amortization of unrecognized losses, transition obligation and prior service cost included in net loss, Net of tax	1.3	1.2
Other, Before tax	0.1	0
Other, Tax	0	0
Other, Net of tax	(0.1)	0
Unrecognized losses, transition obligation and prior service cost, Before tax	1.5	1.9
Unrecognized losses, transition obligation and prior service cost, Tax	(0.5)	(0.7)
Unrecognized losses, transition obligation and prior service cost, Net of tax	1.0	1.2
Other comprehensive income, Before tax	45.1	46.1
Other comprehensive income, Tax	(0.7)	(0.7)
Other comprehensive income, Net of tax	44.4	45.4
Total Comprehensive Loss, Before tax	(19.8)	(28.6)
Total Comprehensive Loss, Tax	18.5	20.8
Total Comprehensive Loss, Net of tax	(1.3)	(7.8)
Less: comprehensive loss attributable to noncontrolling interest, Before tax	(2.4)	(8.5)
Less: comprehensive loss attributable to noncontrolling interest, Tax	0.2	0.7
Less: comprehensive loss attributable to noncontrolling interest, Net of tax	(2.2)	(7.8)
Comprehensive Income (Loss) Attributable to IPG, Before tax	(17.4)	(20.1)
Comprehensive Income (Loss) Attributable to IPG, Tax	18.3	20.1
Comprehensive Income (Loss) Attributable to IPG, Net of tax	$ 0.9	$ 0