Commitments And Contingencies (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2018	Dec. 31, 2017
Loss Contingencies [Line Items]
Undrawn capital and purchase commitments	$ 298.8	$ 292.8

The company's investment may take the form of the general partner or a limited partner, and the entities are structured such that each partner makes capital commitments that may be drawn down over the life of the partnership as investment opportunities are identified.

No definition available.

Name:	ivz_UndrawnCapitalCommitments
Namespace Prefix:	ivz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration