Earnings Per Share (Calculation Of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Earnings Per Share [Abstract]
Income from continuing operations, net of taxes	$ 214.2	$ 157.8
Net (income)/loss attributable to noncontrolling interests in consolidated entities	(2.2)	3.2
Net income attributable to Invesco Ltd	212.0	161.0
Allocation of earnings to restricted shares	(6.4)	(4.2)
Net income attributable to common shareholders	$ 205.6	$ 156.8
Weighted average shares outstanding - basic (in shares)	407.7	418.7
Weighted Average Number of Shares, Restricted Stock	(12.2)	(11.0)
Weighted Average Number of Shares Outstanding, Basic - Common shares	395.5	407.7
Dilutive effect on share-based awards (in shares)	0.3	0.2
Weighted Average Number of Shares Outstanding, Diluted - Common shares	395.8	407.9
Weighted average shares outstanding - diluted (in shares)	408.0	418.9
Earnings per share:
Basic earnings per share (usd per share)	$ 0.52	$ 0.38
Diluted earnings per share:
Diluted earnings per share (usd per share)	$ 0.52	$ 0.38