Condensed Consolidated Statements of Changes in Equity (Unaudited) - USD ($) $ in Millions	Total	Preferred Shares	Common Shares	Additional Paid-in-Capital	Treasury Shares	Retained Earnings	Accumulated Other Comprehensive Income/(Loss)	Total Equity Attributable to Invesco Ltd.	Nonredeemable Noncontrolling Interests in Consolidated Entities	Redeemable Noncontrolling Interests in Consolidated Entities Temporary Equity
Beginning balance at Dec. 31, 2017	$ 8,955.6		$ 98.1	$ 6,282.0	$ (2,781.9)	$ 5,489.1	$ (391.2)	$ 8,696.1	$ 259.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	798.3					768.6		768.6	29.7
Other comprehensive income/(loss)	(191.4)						(191.4)	(191.4)
Change in noncontrolling interests in consolidated entities, net	42.5								42.5
Dividends - common	(368.3)					(368.3)		(368.3)
Common share-based compensation	124.5			124.5				124.5
Vested common shares	0.0			(114.6)	114.6			0.0
Other common share awards	7.3			1.1	6.2			7.3
Purchase of common shares	(49.7)				(49.7)			(49.7)
Ending balance at Sep. 30, 2018	9,318.8		98.1	6,293.0	(2,710.8)	5,892.6	(585.8)	8,987.1	331.7
Beginning balance at Dec. 31, 2017										$ 243.2
Increase (Decrease) in Temporary Equity [Roll Forward]
Net income										(10.0)
Change in noncontrolling interests in consolidated entities, net										190.0
Ending balance at Sep. 30, 2018										423.2
Beginning balance at Jun. 30, 2018	9,136.2		98.1	6,255.6	(2,720.0)	5,747.3	(563.7)	8,817.3	318.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	279.2					269.6		269.6	9.6
Other comprehensive income/(loss)	(22.1)						(22.1)	(22.1)
Change in noncontrolling interests in consolidated entities, net	3.2								3.2
Dividends - common	(124.3)					(124.3)		(124.3)
Common share-based compensation	42.7			42.7				42.7
Vested common shares				(6.2)	6.2
Other common share awards	6.7			0.9	5.8			6.7
Purchase of common shares	(2.8)				(2.8)			(2.8)
Ending balance at Sep. 30, 2018	9,318.8		98.1	6,293.0	(2,710.8)	5,892.6	(585.8)	8,987.1	331.7
Beginning balance at Jun. 30, 2018										297.0
Increase (Decrease) in Temporary Equity [Roll Forward]
Net income										2.0
Change in noncontrolling interests in consolidated entities, net										124.2
Ending balance at Sep. 30, 2018										423.2
Beginning balance at Dec. 31, 2018	8,936.2	$ 0.0	98.1	6,334.8	(3,003.6)	5,884.5	(735.0)	8,578.8	357.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	471.0					449.3		449.3	21.7
Other comprehensive income/(loss)	(69.3)						(69.3)	(69.3)
Change in noncontrolling interests in consolidated entities, net	9.3								9.3
Issuance of shares	5,463.8	4,010.5	15.1	1,438.2		0.0		5,463.8
Dividends - preferred	(64.4)					(64.4)		(64.4)
Dividends - common	(389.4)					(389.4)		(389.4)
Common share-based compensation	158.8			158.8				158.8
Vested common shares	88.7			(107.8)	196.5			88.7
Other common share awards	7.3			(1.2)	8.5			7.3
Purchase of common shares	(650.4)				(650.4)			(650.4)
Ending balance at Sep. 30, 2019	13,961.6	4,010.5	113.2	7,822.8	(3,449.0)	5,880.0	(804.3)	13,573.2	388.4
Beginning balance at Dec. 31, 2018	396.2									396.2
Increase (Decrease) in Temporary Equity [Roll Forward]
Net income										24.2
Change in noncontrolling interests in consolidated entities, net										(22.4)
Ending balance at Sep. 30, 2019	398.0									398.0
Beginning balance at Jun. 30, 2019	14,299.7	4,010.5	113.2	7,810.8	(3,185.2)	5,856.8	(671.4)	13,934.7	365.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	243.0					231.5		231.5	11.5
Other comprehensive income/(loss)	(132.9)						(132.9)	(132.9)
Change in noncontrolling interests in consolidated entities, net	11.9								11.9
Dividends - preferred	(64.4)					(64.4)		(64.4)
Dividends - common	(143.9)					(143.9)		(143.9)
Common share-based compensation	49.4			49.4				49.4
Vested common shares	0.0			(36.3)	36.3			0.0
Other common share awards	6.7				7.8			6.7
Purchase of common shares	(307.9)				(307.9)			(307.9)
Ending balance at Sep. 30, 2019	13,961.6	$ 4,010.5	$ 113.2	$ 7,822.8	$ (3,449.0)	$ 5,880.0	$ (804.3)	$ 13,573.2	$ 388.4
Beginning balance at Jun. 30, 2019										396.4
Increase (Decrease) in Temporary Equity [Roll Forward]
Net income										(0.4)
Change in noncontrolling interests in consolidated entities, net										2.0
Ending balance at Sep. 30, 2019	$ 398.0									$ 398.0