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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
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