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Rental Equipment (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Operating Leased Assets [Line Items] |  |
Rental Equipment | $ 154.5 | $ 152.2
Less: Accumulated depreciation | 45.4 | 43.8
Rental equipment, net | $ 109.1 | $ 108.4

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- Definition Depreciable Rental Equipment Available for Operating Lease Before Accumulated Depreciation + References No definition available. + Details
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Namespace Prefix: | fss_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Depreciable Renta lEquipmen tAvailable for Operating Lease Net + References No definition available. + Details
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Namespace Prefix: | fss_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Depreciable Rental Equipment Available for Operating Leases Accumulated Depreciation + References No definition available. + Details
Name: | fss_DepreciableRentalEquipmentAvailableforOperatingLeasesAccumulatedDepreciation
Namespace Prefix: | fss_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_OperatingLeasedAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration