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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName FEDERATED FIXED INCOME SECURITIES INC
Prospectus Date rr_ProspectusDate Mar. 24, 2020
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock IMPORTANT INFORMATION REGARDING
THE FEDERATED HERMES FUNDS*

SUPPLEMENT TO CURRENT SUMMARY PROSPECTUSES, PROSPECTUSES AND STATEMENTS OF ADDITIONAL INFORMATION

* The Federated Hermes Funds include the below listed registrants and funds (including all share classes)

On February 13, 2020, in connection with Federated Investors, Inc.'s corporate name change to Federated Hermes, Inc., which became effective January 31, 2020, the Boards of Directors/Trustees (the "Boards") of the Federated Hermes funds listed below (the "Funds") approved changing each Fund's name to replace "Federated" with "Federated Hermes." In addition, the Boards approved changing each Fund's registrant name (the "Registrant") as noted below. There are no changes in fund operations or investment policies as a result of the name changes. The Fund and Registrant name changes will be effective at the close of business on June 26, 2020.

CURRENT REGISTRANT/FUND NAME NEW REGISTRANT/FUND NAME
Federated Fixed Income Securities, Inc. Federated Hermes Fixed Income Securities, Inc.
Federated Municipal Ultrashort Fund Federated Hermes Municipal Ultrashort Fund
Federated Strategic Income Fund Federated Hermes Strategic Income Fund
Federated Hermes Municipal Ultrashort Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock IMPORTANT INFORMATION REGARDING
THE FEDERATED HERMES FUNDS*

SUPPLEMENT TO CURRENT SUMMARY PROSPECTUSES, PROSPECTUSES AND STATEMENTS OF ADDITIONAL INFORMATION

* The Federated Hermes Funds include the below listed registrants and funds (including all share classes)

On February 13, 2020, in connection with Federated Investors, Inc.'s corporate name change to Federated Hermes, Inc., which became effective January 31, 2020, the Boards of Directors/Trustees (the "Boards") of the Federated Hermes funds listed below (the "Funds") approved changing each Fund's name to replace "Federated" with "Federated Hermes." In addition, the Boards approved changing each Fund's registrant name (the "Registrant") as noted below. There are no changes in fund operations or investment policies as a result of the name changes. The Fund and Registrant name changes will be effective at the close of business on June 26, 2020.

CURRENT REGISTRANT/FUND NAME NEW REGISTRANT/FUND NAME
Federated Fixed Income Securities, Inc. Federated Hermes Fixed Income Securities, Inc.
Federated Municipal Ultrashort Fund Federated Hermes Municipal Ultrashort Fund
Federated Hermes Strategic Income Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock IMPORTANT INFORMATION REGARDING
THE FEDERATED HERMES FUNDS*

SUPPLEMENT TO CURRENT SUMMARY PROSPECTUSES, PROSPECTUSES AND STATEMENTS OF ADDITIONAL INFORMATION

* The Federated Hermes Funds include the below listed registrants and funds (including all share classes)

On February 13, 2020, in connection with Federated Investors, Inc.'s corporate name change to Federated Hermes, Inc., which became effective January 31, 2020, the Boards of Directors/Trustees (the "Boards") of the Federated Hermes funds listed below (the "Funds") approved changing each Fund's name to replace "Federated" with "Federated Hermes." In addition, the Boards approved changing each Fund's registrant name (the "Registrant") as noted below. There are no changes in fund operations or investment policies as a result of the name changes. The Fund and Registrant name changes will be effective at the close of business on June 26, 2020.

CURRENT REGISTRANT/FUND NAME NEW REGISTRANT/FUND NAME
Federated Fixed Income Securities, Inc. Federated Hermes Fixed Income Securities, Inc.
Federated Strategic Income Fund Federated Hermes Strategic Income Fund