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Concentration Risk Voluntary Fee Waivers (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Concentration Risk [Line Items]
Revenue	$ (0.1)	$ (21.3)	$ (4.4)	$ (58.8)
Less: Reduction in Distribution expense	0.1	16.5	3.6	44.4
Operating income	0.0	(4.8)	(0.8)	(14.4)
Less: Increase in Noncontrolling interests	0.0	(0.2)	0.0	0.0
Pre-tax impact	$ 0.0	$ (5.0)	$ (0.8)	$ (14.4)

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

Name:	fii_DecreaseInNetIncomeAttributableToNoncontrollingInterests
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

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