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Leases (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Lessee, Lease, Description [Line Items] |  |
Lease not yet commenced, expense | $ 0.4 | $ 34.7
Maximum |  |
Lessee, Lease, Description [Line Items] |  |
Remaining lease term | 33 years |

X
- Definition Lease, Not Yet Commenced, Expense + References No definition available. + Details
Name: | fls_LeaseNotYetCommencedExpense
Namespace Prefix: | fls_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Lease, Remaining Lease Term + References No definition available. + Details
Name: | fls_LeaseRemainingLeaseTerm
Namespace Prefix: | fls_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- 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_LesseeLeaseDescriptionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |