XML 126 R78.htm IDEA: XBRL DOCUMENT
v3.22.4

Pension and Other Post-Employment Plans - Summary of Weighted-Average Assumptions Used in Determining Benefit Obligations (Details) | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
U.S. Benefit Plan |  |
Schedule of Net Periodic Benefit Costs Weighted Average Assumptions [Line Items] |  |
Discount rate | 5.70% | 3.10%
Non-U.S. Benefit Plan |  |
Schedule of Net Periodic Benefit Costs Weighted Average Assumptions [Line Items] |  |
Discount rate | 4.80% | 1.80%

X
- Definition Schedule of Net Periodic Benefit Costs Weighted Average Assumptions [Line Items] + References No definition available. + Details
Name: | fss_ScheduleOfNetPeriodicBenefitCostsWeightedAverageAssumptionsLineItems
Namespace Prefix: | fss_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_RetirementPlanSponsorLocationAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanSponsorLocationAxis=us-gaap_ForeignPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |