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Commitments and Contingencies (Details) $ in Millions	Sep. 30, 2017 USD ($)
Employee Incentive Compensation Maximum Bonus Payable Over Remaining Terms	$ 8.0
Employment-related Commitments [Member]
Unrecorded Unconditional Purchase Obligation	$ 6.0

X

- Definition

The aggregate maximum bonus payable to employees over the remaining terms of incentive compensation-related contracts.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77896938&loc=d3e25336-109308

+ Details

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

X

- Details

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