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Commitments and Contingencies (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	36 Months Ended
	Dec. 31, 2008	Jun. 30, 2016	Jan. 31, 2015	Dec. 01, 2008
Compensation-related payments in connection with significant employment and incentive arrangements		$ 31.0
Prior Business Acquisition Required Compound Annual Growth Rate to Have Earned Maximum Contingent Payments	30.00%
Alleged damages sought		37.0
Clover Capital Acquisition [Member]
Business Acquisition Cost Of Acquired Entity Upfront Cash Paid	$ 30.0
Maximum contingent payments under acquisition agreement				$ 55.0
Contingent purchase price payments			$ 18.0
Federated Global Investment Management Corp [Member] | Operating Expense [Member]
Loss Contingency Accrual, Payments		$ 1.5

X

- Definition

The amount of cash payment resulting from the contingent consideration arrangement.

+ References

No definition available.

+ Details

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Namespace Prefix:	fii_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of upfront cash paid to acquire the entity.

+ References

No definition available.

+ Details

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Namespace Prefix:	fii_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The aggregate compensation-related payable relating to various significant employment and incentive arrangements over the remaining terms.

+ References

No definition available.

+ Details

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Namespace Prefix:	fii_
Data Type:	xbrli:monetaryItemType
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X

- Definition

The rate of compounded annual revenue growth necessary in order to have achieved the potential maximum contingent payments.

+ References

No definition available.

+ Details

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Namespace Prefix:	fii_
Data Type:	num:percentItemType
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X

- Definition

For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of cash outflow reducing loss contingency liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The value (monetary amount) of the award the plaintiff seeks in the legal matter.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349

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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_OperatingExpenseMember
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Period Type: