Consolidated Investment Products (Condensed Consolidating Statement Of Income Line Items Reflecting Impact Of Consolidation Of Investment Products Into The Condensed Consolidated Statements Of Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement [Line Items]
Total operating expenses	$ 1,445.5	$ 1,019.7	$ 3,881.0	$ 3,083.7
Operating income	275.1	322.1	493.6	974.5
Equity in earnings of unconsolidated affiliates	19.8	11.8	46.9	28.8
Interest and dividend income	5.9	4.0	14.5	11.0
Other gains and losses, net	13.8	5.9	69.0	1.9
Other gains/(losses) of CIP, net	37.0	28.1	127.0	56.2
Income before income taxes	316.6	342.3	649.9	990.1
Net income	242.6	281.2	495.2	788.3
Net (income)/loss attributable to noncontrolling interests in consolidated entities	(11.1)	(11.6)	(45.9)	(19.7)
Net income attributable to Invesco Ltd.	167.1	269.6	384.9	768.6
Impact of CIP
Statement [Line Items]
Total operating revenues	(8.5)	(4.7)	(24.4)	(18.8)
Total operating expenses	9.4	5.1	17.6	14.5
Operating income	(17.9)	(9.8)	(42.0)	(33.3)
Equity in earnings of unconsolidated affiliates	(9.5)	(3.4)	(8.6)	(9.8)
Interest and dividend income	(0.7)	0.0	(3.1)	0.0
Other gains and losses, net	0.3	8.0	(28.7)	16.3
Interest and dividend income of CIP	90.4	71.0	261.8	196.0
Interest expense of CIP	(58.0)	(51.7)	(170.8)	(137.5)
Other gains/(losses) of CIP, net	4.6	8.8	36.0	(2.3)
Income before income taxes	9.2	22.9	44.6	29.4
Net income	9.2	22.9	44.6	29.4
Net (income)/loss attributable to noncontrolling interests in consolidated entities	(11.1)	(11.6)	(45.9)	(19.7)
Net income attributable to Invesco Ltd.	$ (1.9)	$ 11.3	$ (1.3)	$ 9.7