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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

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Namespace Prefix:	fii_
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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

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