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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Total operating revenues	$ 1,341.8		$ 4,058.2
Total operating expenses	1,019.7	$ 977.4	3,083.7	$ 2,848.2
Operating Income (Loss)	322.1	360.3	974.5	936.5
Equity in earnings of unconsolidated affiliates	11.8	12.9	28.8	41.1
Interest and dividend income	4.0	2.5	11.0	7.0
Other gains and losses, net	5.9	13.9	1.9	23.9
Other gains/(losses) of CIP, net	28.1	31.7	56.2	92.5
Income before income taxes	342.3	397.7	990.1	1,029.8
Income tax provision	61.1	123.1	201.8	291.4
Net income	281.2	274.6	788.3	738.4
Net (income)/loss attributable to noncontrolling interests in consolidated entities	(11.6)	(7.1)	(19.7)	(19.3)
Net income attributable to Invesco Ltd	269.6	267.5	768.6	719.1
Impact of CIP [Member]
Total operating revenues	(4.7)	(6.2)	(18.8)	(25.7)
Total operating expenses	5.1	4.2	14.5	5.2
Operating Income (Loss)	(9.8)	(10.4)	(33.3)	(30.9)
Equity in earnings of unconsolidated affiliates	(3.4)	(5.7)	(9.8)	(8.4)
Other gains and losses, net	8.0	(9.8)	16.3	(32.4)
Interest and dividend income of CIP	71.0	52.7	196.0	156.4
Interest expense of CIP	51.7	36.3	137.5	117.3
Other gains/(losses) of CIP, net	8.8	15.3	(2.3)	53.4
Income before income taxes	22.9	5.8	29.4	20.8
Net income	22.9	5.8	29.4	20.8
Net (income)/loss attributable to noncontrolling interests in consolidated entities	11.6	7.1	19.7	19.3
Net income attributable to Invesco Ltd	$ 11.3	$ (1.3)	$ 9.7	$ 1.5