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, 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				5,463.8
Dividends declared - preferred	(64.4)					(64.4)		(64.4)
Dividends declared - 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
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
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 declared - preferred	(64.4)					(64.4)		(64.4)
Dividends declared - 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			(1.1)	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
Beginning balance at Dec. 31, 2019	14,318.3	4,010.5	113.2	7,860.8	(3,452.5)	5,917.8	(587.3)	13,862.5	455.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	487.9					491.3		491.3	(3.4)
Other comprehensive income/(loss)	(60.6)						(60.6)	(60.6)
Change in noncontrolling interests in consolidated entities, net	(35.8)								(35.8)
Dividends declared - preferred	(177.6)					(177.6)		(177.6)
Dividends declared - common	(287.0)					(287.0)		(287.0)
Common share-based compensation	138.2			138.2				138.2
Vested common shares	0.0			(200.3)	200.3			0.0
Other common share awards	7.9			(10.1)	18.0			7.9
Purchase of common shares	(40.7)				(40.7)			(40.7)
Ending balance at Sep. 30, 2020	14,350.6	4,010.5	113.2	7,788.6	(3,274.9)	5,944.5	(647.9)	13,934.0	416.6
Beginning balance at Dec. 31, 2019	383.5									383.5
Increase (Decrease) in Temporary Equity [Roll Forward]
Net income										(11.2)
Change in noncontrolling interests in consolidated entities, net										(144.1)
Ending balance at Sep. 30, 2020	228.2									228.2
Beginning balance at Jun. 30, 2020	13,967.7	4,010.5	113.2	7,788.4	(3,319.1)	5,825.0	(816.0)	13,602.0	365.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	283.5					250.9		250.9	32.6
Other comprehensive income/(loss)	168.1						168.1	168.1
Change in noncontrolling interests in consolidated entities, net	18.3								18.3
Dividends declared - preferred	(59.2)					(59.2)		(59.2)
Dividends declared - common	(72.2)					(72.2)		(72.2)
Common share-based compensation	43.0			43.0				43.0
Vested common shares	0.0			(33.3)	33.3			0.0
Other common share awards	7.2			(9.5)	16.7			7.2
Purchase of common shares	(5.8)				(5.8)			(5.8)
Ending balance at Sep. 30, 2020	14,350.6	$ 4,010.5	$ 113.2	$ 7,788.6	$ (3,274.9)	$ 5,944.5	$ (647.9)	$ 13,934.0	$ 416.6
Beginning balance at Jun. 30, 2020										202.8
Increase (Decrease) in Temporary Equity [Roll Forward]
Net income										11.2
Change in noncontrolling interests in consolidated entities, net										14.2
Ending balance at Sep. 30, 2020	$ 228.2									$ 228.2