Consolidated Statements of Changes in Equity - USD ($) $ in Millions	Total	Adjustment for adoption of ASU	Adjusted balance	Preferred Shares	Common Shares	Common Shares Adjusted balance	Additional Paid-in-Capital	Additional Paid-in-Capital Adjusted balance	Treasury Shares	Treasury Shares Adjusted balance	Retained Earnings	Retained Earnings Adjustment for adoption of ASU	Retained Earnings Adjusted balance	Accumulated Other Comprehensive Income	Accumulated Other Comprehensive Income Adjustment for adoption of ASU	Accumulated Other Comprehensive Income Adjusted balance	Total Equity Attributable to Invesco Ltd.	Total Equity Attributable to Invesco Ltd. Adjusted balance	Nonredeemable Noncontrolling Interests in Consolidated Entities	Nonredeemable Noncontrolling Interests in Consolidated Entities Adjusted balance
Beginning balance at Dec. 31, 2017	$ 8,955.6		$ 8,955.6		$ 98.1	$ 98.1	$ 6,282.0	$ 6,282.0	$ (2,781.9)	$ (2,781.9)	$ 5,489.1	$ 3.2	$ 5,492.3	$ (391.2)	$ (3.2)	$ (394.4)	$ 8,696.1	$ 8,696.1	$ 259.5	$ 259.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	911.1										882.8						882.8		28.3
Other comprehensive income/(loss), net of tax	(340.6)													(340.6)			(340.6)
Change in noncontrolling interests in consolidated entities, net	69.6																		69.6
Dividends declared - common	(490.6)										(490.6)						(490.6)
Employee common share plans:
Common share-based compensation	172.4						172.4										172.4
Vested common shares	0.0						(120.6)		120.6
Other share awards	7.6						1.0		6.6								7.6
Purchase of common shares	(348.9)								(348.9)								(348.9)
Ending 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
Beginning Balance at Dec. 31, 2017	243.2	$ 0.0	$ 243.2
Increase (Decrease) in Temporary Equity [Roll Forward]
Net income	(28.0)
Change in noncontrolling interests in consolidated entities, net	181.0
Ending Balance at Dec. 31, 2018	396.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	697.8										688.3						688.3		9.5
Other comprehensive income/(loss), net of tax	147.7													147.7			147.7
Change in noncontrolling interests in consolidated entities, net	88.9																		88.9
Issuance of shares	5,463.8			4,010.5	15.1		1,438.2										5,463.8
Dividends declared - preferred	(123.6)										(123.6)						(123.6)
Dividends declared - common	(531.4)										(531.4)						(531.4)
Employee common share plans:
Common share-based compensation	207.5						207.5										207.5
Vested common shares	88.7						(118.3)		207.0								88.7
Other share awards	7.5						(1.4)		8.9								7.5
Purchase of common shares	(664.8)								(664.8)								(664.8)
Ending 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 Temporary Equity [Roll Forward]
Net income	40.0
Change in noncontrolling interests in consolidated entities, net	(52.7)
Ending Balance at Dec. 31, 2019	383.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	796.3										761.6						761.6		34.7
Other comprehensive income/(loss), net of tax	182.8													182.8			182.8
Change in noncontrolling interests in consolidated entities, net	(43.4)																		(43.4)
Issuance of shares	0.0			0.0	0.0		0.0										0.0
Dividends declared - preferred	(236.8)										(236.8)						(236.8)
Dividends declared - common	(357.6)										(357.6)						(357.6)
Employee common share plans:
Common share-based compensation	188.5						188.5										188.5
Vested common shares	0.0						(227.3)		227.3
Other share awards	7.9						(10.6)		18.5								7.9
Purchase of common shares	(47.1)								(47.1)								(47.1)
Ending balance at Dec. 31, 2020	14,808.9			$ 4,010.5	$ 113.2		$ 7,811.4		$ (3,253.8)		$ 6,085.0			$ (404.5)			$ 14,361.8		$ 447.1
Increase (Decrease) in Temporary Equity [Roll Forward]
Net income	11.2
Change in noncontrolling interests in consolidated entities, net	(182.9)
Ending Balance at Dec. 31, 2020	$ 211.8