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Concentration Risk Voluntary Fee Waivers (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Concentration Risk [Line Items] |  |  |  |
Revenue | $ 0.0 | $ (18.0) | $ (4.4) | $ (76.8)
Less: Reduction in Distribution expense | 0.0 | 13.8 | 3.6 | 58.2
Pre-tax impact | $ 0.0 | $ (4.2) | $ (0.8) | $ (18.6)

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 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