XML 51 R34.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Significant Accounting Policies and Accounting Developments (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2021
Accounting Policies [Abstract] |
Schedule of Estimated Useful Lives of Assets | Generally, the estimated useful lives of the assets are:
Buildings and improvements | 10 to 40 years
Machinery, equipment and tooling | 3 to 14 years
Software, furniture and fixtures and other | 3 to 7 years

X
- Definition Schedule of Estimated Useful Lives of Assets [Table Text Block] + References No definition available. + Details
Name: | fls_ScheduleOfEstimatedUsefulLivesOfAssetsTableTextBlock
Namespace Prefix: | fls_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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