XML 132 R79.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Pensions - Summary of Weighted-Average Actuarial Assumptions (Details) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
U.S. Benefit Plan |  |  |
Schedule of Net Periodic Benefit Costs Weighted Average Assumptions [Line Items] |  |  |
Discount rate | 3.70% | 4.30% | 4.60%
Expected long term rate of return on plan assets | 7.00% | 7.10% | 7.50%
Non-U.S. Benefit Plan |  |  |
Schedule of Net Periodic Benefit Costs Weighted Average Assumptions [Line Items] |  |  |
Discount rate | 2.50% | 2.60% | 3.70%
Expected long term rate of return on plan assets | 4.20% | 4.20% | 4.90%

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 net periodic benefit cost of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RetirementPlanSponsorLocationAxis=us-gaap_DomesticPlanMember
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: |