Consolidated Investment Products (CIP) - 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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting, Other Significant Reconciling Items [Line Items]
Total operating expenses	$ 1,229.1	$ 1,445.5	$ 3,812.9	$ 3,881.0
Operating income	268.5	275.1	702.6	493.6
Equity in earnings of unconsolidated affiliates	18.6	19.8	46.7	46.9
Interest and dividend income	2.6	5.9	11.4	14.5
Other gains and losses, net	31.5	13.8	(15.0)	69.0
Other gains/(losses) of CIP, net	99.2	37.0	28.6	127.0
Income before income taxes	386.6	316.6	669.4	649.9
Net income	294.7	242.6	476.7	495.2
Net (income)/loss attributable to noncontrolling interests in consolidated entities	(43.8)	(11.1)	14.6	(45.9)
Net income attributable to Invesco Ltd.	191.7	167.1	313.7	384.9
Consolidated
Segment Reporting, Other Significant Reconciling Items [Line Items]
Total operating revenues	(10.4)	(8.5)	(29.8)	(24.4)
Total operating expenses	4.4	9.4	22.9	17.6
Operating income	(14.8)	(17.9)	(52.7)	(42.0)
Equity in earnings of unconsolidated affiliates	(26.0)	(9.5)	10.8	(8.6)
Interest and dividend income	0.0	(0.7)	(0.3)	(3.1)
Other gains and losses, net	(5.0)	0.3	8.4	(28.7)
Interest and dividend income of CIP	76.3	90.4	241.2	261.8
Interest expense of CIP	(41.8)	(58.0)	(151.2)	(170.8)
Other gains/(losses) of CIP, net	64.7	4.6	(61.4)	36.0
Income before income taxes	53.4	9.2	(5.2)	44.6
Net income	53.4	9.2	(5.2)	44.6
Net (income)/loss attributable to noncontrolling interests in consolidated entities	(43.8)	(11.1)	14.6	(45.9)
Net income attributable to Invesco Ltd.	$ 9.6	$ (1.9)	$ 9.4	$ (1.3)