Earnings Per Share (Calculation Of Earnings Per Share) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share [Abstract]
Income from continuing operations, net of taxes	$ 250.1	$ 153.7	$ 653.9	$ 452.0
Net (income)/loss attributable to noncontrolling interests in consolidated entities	(20.6)	13.7	0.9	59.1
Income from continuing operations attributable to Invesco Ltd. for basic and diluted EPS calculations	229.5	167.4	654.8	511.1
Income/(loss) from discontinued operations, net of taxes	(1.4)	3.2	(1.9)	7.3
Net income attributable to common shareholders	228.1	170.6	652.9	518.4
Weighted average shares outstanding - basic	447.9	451.3	448.3	453.1
Dilutive effect of share-based awards	$ 0.9	$ 1.5	$ 1.1	$ 1.5
Weighted average shares outstanding - diluted	448.8	452.8	449.4	454.6
Earnings per share from continuing operations	$ 0.51	$ 0.37	$ 1.46	$ 1.13
Earnings per share from discontinued operations	$ 0.00	$ 0.01	$ 0.00	$ 0.02
Basic earnings per share	$ 0.51	$ 0.38	$ 1.46	$ 1.14
Earnings per share from continuing operations	$ 0.51	$ 0.37	$ 1.46	$ 1.12
Earnings per share from discontinued operations	$ 0.00	$ 0.01	$ 0.00	$ 0.02
Diluted earnings per share	$ 0.51	$ 0.38	$ 1.45	$ 1.14