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
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting, Other Significant Reconciling Items [Line Items]
Total operating expenses	$ 1,281.9	$ 1,014.4
Operating income	317.0	200.2
Equity in earnings of unconsolidated affiliates	16.9	15.0
Interest and dividend income	6.4	4.7
Other gains and losses, net	(106.5)	31.1
Other gains/(losses) of CIP, net	(20.1)	38.9
Income before income taxes	177.4	256.8
Income tax provision	(57.4)	(66.2)
Net income	120.0	190.6
Net (income)/loss attributable to noncontrolling interests in consolidated entities	20.7	(12.9)
Net income attributable to Invesco Ltd.	81.5	177.7
Impact of CIP
Segment Reporting, Other Significant Reconciling Items [Line Items]
Total operating revenues	(8.9)	(8.7)
Total operating expenses	17.0	2.8
Operating income	(25.9)	(11.5)
Equity in earnings of unconsolidated affiliates	(16.6)	6.5
Interest and dividend income	(0.1)	(1.3)
Other gains and losses, net	41.8	(20.7)
Interest and dividend income of CIP	85.2	84.7
Interest expense of CIP	(56.9)	(58.0)
Other gains/(losses) of CIP, net	(48.4)	12.2
Income before income taxes	(20.8)	11.9
Income tax provision	0.0	0.0
Net income	(20.8)	11.9
Net (income)/loss attributable to noncontrolling interests in consolidated entities	20.7	(12.9)
Net income attributable to Invesco Ltd.	$ (0.1)	$ (1.0)