Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 157.8	$ 284.0
Other Comprehensive Income (Loss), before Tax [Abstract]
Currency translation differences on investments in foreign subsidiaries, net of tax	97.2	(302.9)
Actuarial (loss)/gain related to employee benefit plans, net of tax	(0.4)	0.0
Reclassification of prior service cost/(credit) into employee compensation expense, net of tax	(1.6)	(1.8)
Reclassification of actuarial (gain)/loss into employee compensation expense, net of tax	0.3	0.5
Share of other comprehensive income/(loss) of equity method investments, net of tax	(0.3)	1.1
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	2.3	1.2
Reclassification of net (gains)/losses realized on available-for-sale investments included in other gains and losses, net, net of tax	(0.2)	(0.5)
Other comprehensive income/(loss), net of tax	97.3	(302.4)
Total comprehensive income/(loss)	255.1	(18.4)
Comprehensive loss/(income) attributable to noncontrolling interests in consolidated entities	3.2	(24.4)
Comprehensive income/(loss) attributable to Invesco Ltd.	$ 258.3	$ (42.8)