Dividends Withholding Tax Rate

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- Definition

Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate, Proposed Tax Rate, Next Twelve Months

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- Definition

Unremitted Foreign Earnings

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- Definition

Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences.

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- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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Amount of deferred tax liability attributable to taxable temporary differences net of deferred tax asset attributable to deductible temporary differences and carryforwards after valuation allowances.

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Amount of deferred tax liability attributable to taxable temporary differences from undistributed earnings of subsidiaries and other recognized entities not within the country of domicile of the entity.

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- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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- Definition

The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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-Glossary Income Tax Expense (or Benefit)

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Amount of (increase) decrease reasonably possible in the estimated lower bound of the unrecognized tax benefit for a tax position taken or expected to be taken.

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Amount of (increase) decrease reasonably possible in the estimated upper bound of the unrecognized tax benefit for a tax position taken or expected to be taken.

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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Taxation (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Deferred Tax Assets, Net	$ 18.3us-gaap_DeferredTaxAssetsLiabilitiesNet	$ 7.4us-gaap_DeferredTaxAssetsLiabilitiesNet
Deferred tax liabilities, net	304.8us-gaap_DeferredTaxLiabilities	323.6us-gaap_DeferredTaxLiabilities
Statutory tax rate	35.00%	35.00%	35.00%
Deferred Tax Assets, Operating Loss Carryforwards	(285.1)	(332.0)
Unremitted Foreign Earnings	969.9ivz_UnremittedForeignEarnings	1,007.6ivz_UnremittedForeignEarnings
Deferred Tax Liabilities, Undistributed Foreign Earnings	1.6	1.4
Unrecognized Tax Benefits	6.0us-gaap_UnrecognizedTaxBenefits	16.8us-gaap_UnrecognizedTaxBenefits	22.6us-gaap_UnrecognizedTaxBenefits	19.5us-gaap_UnrecognizedTaxBenefits
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	6.0	12.1
Income Tax Expense (Benefit)	390.6us-gaap_IncomeTaxExpenseBenefit	336.9us-gaap_IncomeTaxExpenseBenefit	261.4us-gaap_IncomeTaxExpenseBenefit
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Lower Bound	0
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Upper Bound	10.0
Expiring In Next Five Fiscal Years [Member]
Deferred Tax Assets, Operating Loss Carryforwards	(40.9)
Expiring In After Five Fiscal Years [Member]
Deferred Tax Assets, Operating Loss Carryforwards	(17.8)
Indefinite Life [Member]
Deferred Tax Assets, Operating Loss Carryforwards	(226.4)
Change during the period [Member]
Deferred Tax Assets, Operating Loss Carryforwards	(46.9)
Impact of foreign exchange translation [Member]
Deferred Tax Assets, Operating Loss Carryforwards	(35.8)
Forfeiture of losses resulting from liquidations or mergers [Member]
Deferred Tax Assets, Operating Loss Carryforwards	(11.1)
United Kingdom
Statutory tax rate	21.00%
Statutory income tax rate, Effective April 1, 2014	20.00%
Canada
Dividends Withholding Tax Rate	5.00%
United States
Statutory tax rate	35.00%
Related to accrued interest and penalties [Member]
Income Tax Examination, Penalties and Interest Accrued	1.0	5.1	5.7
Income Tax Expense (Benefit)	$ 3.8	$ 0.4	$ 0.3