Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating activities:
Net income	$ 1,001.1us-gaap_ProfitLoss	$ 982.8us-gaap_ProfitLoss	$ 587.3us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by/(used in) operating activities:
Amortization and depreciation	89.4	88.4	95.0
Share-based compensation expense	138.0us-gaap_ShareBasedCompensation	133.1us-gaap_ShareBasedCompensation	136.4us-gaap_ShareBasedCompensation
(Gain)/loss on disposal of business, property and equipment, net	0us-gaap_GainLossOnDispositionOfAssets	(64.8)us-gaap_GainLossOnDispositionOfAssets	(0.9)us-gaap_GainLossOnDispositionOfAssets
Other gains and losses, net	(28.1)us-gaap_OtherNoncashIncomeExpense	(34.4)us-gaap_OtherNoncashIncomeExpense	(8.3)us-gaap_OtherNoncashIncomeExpense
Other (gains)/losses of CSIP, net	(13.6)	(2.0)	0
Other (gains)/losses of CIP, net	(20.4)	(61.9)	97.7
Call premium on debt extinguishment	0ivz_Callpremiumondebtextinguishment	0ivz_Callpremiumondebtextinguishment	(23.0)ivz_Callpremiumondebtextinguishment
Equity in earnings of unconsolidated affiliates	(32.8)	(35.5)	(29.7)
Dividends from unconsolidated affiliates	19.6	16.5	15.6
Changes in operating assets and liabilities:
(Increase)/decrease in cash held by CIP	148.5	(298.9)	(36.2)
(Increase)/decrease in cash held by CSIP	1.3	(10.1)	0
(Purchase)/sale of trading investments, net	(2.7)	5.4	(7.2)
(Increase)/decrease in receivables	(265.8)us-gaap_IncreaseDecreaseInReceivables	(593.1)us-gaap_IncreaseDecreaseInReceivables	113.8us-gaap_IncreaseDecreaseInReceivables
Increase/(decrease) in payables	165.9	654.7	(121.2)
Net cash provided by/(used in) operating activities	1,200.4	780.2	819.3
Investing activities:
Purchase of property and equipment	(133.2)	(88.2)	(99.3)
Disposal of property and equipment	0	0	0.6
Purchase of available-for-sale investments	(113.8)	(132.3)	(85.9)
Sale of available-for-sale investments	102.8	26.9	50.6
Purchase of investments by CIP	(5,565.9)	(4,465.4)	(3,252.0)
Sale of investments by CIP	4,022.9	4,440.4	3,346.8
Purchase of investments by CSIP	(683.4)	(116.5)	0
Sale of investments by CSIP	493.6	66.9	0
Purchase of other investments	(123.2)	(239.1)	(126.0)
Sale of other investments	73.7	94.3	83.6
Returns of capital and distributions from unconsolidated partnership investments	38.5	38.0	20.0
Acquisition earn-out payments	0	(1.9)	(37.2)
sale of management contracts	0ivz_SaleOfManagementContracts	0ivz_SaleOfManagementContracts	16.4ivz_SaleOfManagementContracts
Proceeds from Divestiture of Businesses	60.8	137.0	0
Net cash provided by/(used in) investing activities	(1,827.2)	(239.9)	(82.4)
Financing activities:
Proceeds from exercises of share options	11.0	17.9	23.0
Purchases of treasury shares	(269.6)	(470.5)	(265.0)
Dividends paid	(424.0)us-gaap_PaymentsOfDividendsCommonStock	(379.7)us-gaap_PaymentsOfDividendsCommonStock	(289.0)us-gaap_PaymentsOfDividendsCommonStock
Excess tax benefits from share-based compensation	24.0	21.6	12.7
(Repayment)/borrowing of unsettled fund account	(35.7)	35.7	0
Third-party capital invested into CIP	287.0	17.7	20.0
Third-party capital distributed by CIP	(165.8)	(191.5)	(277.0)
Third-party capital invested into CSIP	167.1	3.9	0
Proceeds From Distributions From Affiliates, Consolidated Sponsored Investment Products	(6.0)	0	0
Borrowings of debt of CIP	1,996.3	1,365.4	835.2
Repayments of debt of CIP	(721.8)	(874.8)	(602.7)
Net borrowings/(repayments) under credit facility	0	(586.5)	47.5
Net proceeds from issuance of senior notes	0	981.5	595.1
Repayments of senior notes	0us-gaap_RepaymentsOfNotesPayable	0us-gaap_RepaymentsOfNotesPayable	(745.7)us-gaap_RepaymentsOfNotesPayable
Net cash provided by/(used in) financing activities	862.5	(59.3)	(645.9)
Increase/(decrease) in cash and cash equivalents	235.7	481.0	91.0
Foreign exchange movement on cash and cash equivalents	(52.7)	14.7	17.1
Cash and cash equivalents, beginning of year	1,331.2	835.5	727.4
Cash and cash equivalents, end of year	1,514.2	1,331.2	835.5
Supplemental Cash Flow Information:
Interest paid	(60.7)us-gaap_InterestPaidNet	(32.4)us-gaap_InterestPaidNet	(52.8)us-gaap_InterestPaidNet
Interest received	8.1us-gaap_ProceedsFromInterestReceived	5.4us-gaap_ProceedsFromInterestReceived	5.1us-gaap_ProceedsFromInterestReceived
Taxes paid	$ (405.6)us-gaap_IncomeTaxesPaidNet	$ (268.9)us-gaap_IncomeTaxesPaidNet	$ (214.4)us-gaap_IncomeTaxesPaidNet

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The cash outflow to reacquire common stock during the period.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity.

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The cash outflow associated with other investments held by the entity for investment purposes not otherwise defined in the taxonomy.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

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Interest received on loans and other debt instruments during the current period.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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The net cash inflow or cash outflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is collateralized (backed by pledge, mortgage or other lien in the entity's assets).

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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The cash inflow associated with the sale of other investments not otherwise defined in the taxonomy.

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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The cash outflow for a borrowing supported by a written promise to pay an obligation.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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