Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 241.3	$ 251.6	$ 769.3	$ 775.2
Other Comprehensive Income (Loss), before Tax [Abstract]
Currency translation differences on investments in foreign subsidiaries, net of tax	(223.9)	(255.0)	(364.2)	(177.7)
Actuarial (loss)/gain related to employee benefit plans, net of tax	0.0	4.4	0.0	2.3
Reclassification of prior service cost/(credit) into employee compensation expense, net of tax	(1.8)	(0.4)	(4.8)	(1.1)
Reclassification of actuarial (gain)/loss into employee compensation expense, net of tax	0.6	0.4	1.7	1.4
Share of other comprehensive income/(loss) of equity method investments, net of tax	(1.9)	0.4	(0.6)	7.6
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	(5.8)	(4.2)	(7.6)	9.0
Reclassification of net (gains)/losses realized on available-for-sale investments included in other gains and losses, net, net of tax	(0.7)	(2.4)	(1.6)	(16.6)
Other comprehensive income/(loss), net of tax	(233.5)	(256.8)	(377.1)	(175.1)
Total comprehensive income/(loss)	7.8	(5.2)	392.2	600.1
Comprehensive loss/(income) attributable to noncontrolling interests in consolidated entities	8.0	4.1	(3.1)	(56.9)
Comprehensive income/(loss) attributable to Invesco Ltd.	$ 15.8	$ (1.1)	$ 389.1	$ 543.2