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Concentration Risk - Voluntary Fee Waivers (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Risks and Uncertainties [Abstract] |  |  |
Revenue | $ 0.0 | $ (4.4) | $ (87.8)
Less: Reduction in Distribution Expense | 0.0 | 3.6 | 65.8
Operating Income | 0.0 | (0.8) | (22.0)
Less: Reduction in Noncontrolling Interest | 0.0 | 0.0 | 0.0
Pre-tax Impact | $ 0.0 | $ (0.8) | $ (22.0)

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
- References No definition available. + Details
Name: | us-gaap_RisksAndUncertaintiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration