Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 242.6	$ 281.2	$ 495.2	$ 788.3
Other Comprehensive Income (Loss), net of tax [Abstract]
Currency translation differences on investments in foreign subsidiaries	(133.4)	(23.6)	(71.0)	(192.6)
Other comprehensive income/(loss), net of tax	0.5	1.5	1.7	1.2
Other comprehensive income/(loss)	(132.9)	(22.1)	(69.3)	(191.4)
Total comprehensive income/(loss)	109.7	259.1	425.9	596.9
Comprehensive loss/(income) attributable to noncontrolling interests in consolidated entities	(11.1)	(11.6)	(45.9)	(19.7)
Comprehensive income/(loss) attributable to Invesco Ltd.	$ 98.6	$ 247.5	$ 380.0	$ 577.2