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Share-Based Compensation Plans (Details) - shares	3 Months Ended							9 Months Ended	12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2017	Dec. 31, 2016
Restricted Stock Granted in Period								543,570	943,160
Shares of Federated Class B Common Stock Granted to Non-Management Directors	0	6,000	0	0	0	5,700	0
Class B Common Stock Bonus [Member]
Restricted Stock Granted in Period									464,660
Restricted stock requisite service period								3 years
Class B Common Stock Key Employees [Member]
Restricted stock requisite service period								10 years	10 years

X

- Definition

The number of shares of Class B common stock awarded to non-management directors

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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X

- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Details

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- Details

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