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Concentration Risk Voluntary Fee Waivers (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Concentration Risk [Line Items]
Revenue	$ (21.3)	$ (84.2)	$ (58.8)	$ (178.3)
Less: Reduction in Distribution expense	16.5	60.2	44.4	124.8
Operating income	(4.8)	(24.0)	(14.4)	(53.5)
Less: (Increase)/Reduction in Noncontrolling interests	(0.2)	1.8	0.0	4.3
Pre-tax impact	$ (5.0)	$ (22.2)	$ (14.4)	$ (49.2)

X

- Definition

Decrease in distribution expenses relating to fee waivers in certain money market funds to maintain positive or zero net yields.

+ References

No definition available.

+ Details

Name:	fii_DecreaseInDistributionExpenses
Namespace Prefix:	fii_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Decrease in net income attributable to noncontrolling interests relating to fee waivers in certain money market funds to maintain positive or zero net yields.

+ References

No definition available.

+ Details

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Namespace Prefix:	fii_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Decrease in Operating Income in order for certain money market funds to maintain positive or zero net yields.

+ References

No definition available.

+ Details

Name:	fii_DecreaseInOperatingIncome
Namespace Prefix:	fii_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Decrease in pre-tax income relating to fee waivers in certain money market funds to maintain positive or zero net yields.

+ References

No definition available.

+ Details

Name:	fii_DecreaseInPreTaxIncome
Namespace Prefix:	fii_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Voluntary fee waivers in certain money market funds to maintain positive or zero net yields.

+ References

No definition available.

+ Details

Name:	fii_VoluntaryYieldrelatedFeeWaivers
Namespace Prefix:	fii_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration