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Concentration Risk Voluntary Fee Waivers (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ (11,027) | $ (18,030) | $ (21,333) | $ (37,482) | $ (71,995) | $ (83,254) | $ (84,245) | $ (94,112) | $ (87,800) | $ (333,600) | $ (410,600)
Less: Reduction in Distribution expense | 7,627 | 13,797 | 16,528 | 27,896 | 54,493 | 61,283 | 60,179 | 64,654 | 65,800 | 240,600 | 280,900
Operating income | (3,400) | (4,233) | (4,805) | (9,586) | (17,502) | (21,971) | (24,066) | (29,458) | (22,000) | (93,000) | (129,700)
Less: Reduction in Noncontrolling interest | 0 | 0 | (208) | 208 | 1,093 | 1,716 | 1,851 | 2,454 | 0 | 7,100 | 10,700
Pre-tax impact | $ (3,400) | $ (4,233) | $ (5,013) | $ (9,378) | $ (16,409) | $ (20,255) | $ (22,215) | $ (27,004) | $ (22,000) | $ (85,900) | $ (119,000)

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

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- 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