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Concentration Risk Voluntary Fee Waivers (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Concentration Risk [Line Items]
Revenue	$ (18.0)	$ (83.3)	$ (76.8)	$ (261.6)
Less: Reduction in Distribution expense	13.8	61.3	58.2	186.1
Operating income	(4.2)	(22.0)	(18.6)	(75.5)
Less: Reduction in Noncontrolling interests	0.0	1.7	0.0	6.0
Pre-tax impact	$ (4.2)	$ (20.3)	$ (18.6)	$ (69.5)

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