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Allowance for Expected Credit Losses - Additional Information (Details) | Dec. 31, 2023
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Credit Loss [Abstract] |
Contract assets, allowance for credit loss as a percentage of assets | 1.00%

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- Definition Contract With Customer, Asset, Allowance For Credit Loss, Percentage Of Assets + References No definition available. + Details
Name: | fls_ContractWithCustomerAssetAllowanceForCreditLossPercentageOfAssets
Namespace Prefix: | fls_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_CreditLossAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration