Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 236.5	$ 244.0	$ 394.3	$ 528.0
Other Comprehensive Income (Loss), before Tax [Abstract]
Currency translation differences on investments in foreign subsidiaries, net of tax	(166.6)	162.6	(69.4)	(140.3)
Actuarial (loss)/gain related to employee benefit plans, net of tax	0.0	0.0	(0.4)	0.0
Reclassification of prior service cost/(credit) into employee compensation expense, net of tax	(1.8)	(1.2)	(3.4)	(3.0)
Reclassification of actuarial (gain)/loss into employee compensation expense, net of tax	0.5	0.6	0.8	1.1
Share of other comprehensive income/(loss) of equity method investments, net of tax	0.9	0.2	0.6	1.3
Unrealized (losses)/gains on available-for-sale investments, net of tax	(0.6)	(3.0)	1.7	(1.8)
Reclassification of net (gains)/losses realized on available-for-sale investments included in other gains and losses, net, net of tax	(0.1)	(0.4)	(0.3)	(0.9)
Other comprehensive income/(loss), net of tax	(167.7)	158.8	(70.4)	(143.6)
Total comprehensive income/(loss)	68.8	402.8	323.9	384.4
Comprehensive loss/(income) attributable to noncontrolling interests in consolidated entities	(8.5)	13.3	(5.3)	(11.1)
Comprehensive income/(loss) attributable to Invesco Ltd.	$ 60.3	$ 416.1	$ 318.6	$ 373.3