EARNINGS PER COMMON SHARE - Calculation of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Earnings Per Share [Abstract]
Net income/(loss) attributable to Invesco Ltd.	$ (333.7)	$ 683.9	$ 1,393.0
Weighted average common shares outstanding - basic (shares)	454.8	457.5	462.8
Dilutive effect of non-participating common share-based awards (shares)	1.4	2.0	2.6
Weighted average common shares outstanding - diluted (shares)	456.2	459.5	465.4
Earnings per common share:
- basic (in usd per share)	$ (0.73)	$ 1.50	$ 3.01
- diluted (usd per share)	$ (0.73)	$ 1.49	$ 2.99