Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 214.2	$ 157.8
Other Comprehensive Income (Loss), before Tax [Abstract]
Currency translation differences on investments in foreign subsidiaries, net of tax	62.6	97.2
Actuarial (loss)/gain related to employee benefit plans, net of tax	(0.4)	(0.4)
Reclassification of prior service cost/(credit) into employee compensation expense, net of tax	0.0	(1.6)
Reclassification of actuarial (gain)/loss into employee compensation expense, net of tax	0.6	0.3
Share of other comprehensive income/(loss) of equity method investments, net of tax	0.3	(0.3)
Unrealized (losses)/gains on available-for-sale investments, net of tax	3.1	2.3
Reclassification of net (gains)/losses realized on available-for-sale investments included in other gains and losses, net, net of tax	(0.6)	(0.2)
Other comprehensive income/(loss), net of tax	65.6	97.3
Total comprehensive income/(loss)	279.8	255.1
Comprehensive loss/(income) attributable to noncontrolling interests in consolidated entities	(2.2)	3.2
Comprehensive income/(loss) attributable to Invesco Ltd.	$ 277.6	$ 258.3