XML 76 R64.htm IDEA: XBRL DOCUMENT
v3.25.3

Pension and Postretirement Benefits (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2025 | Dec. 31, 2024
Components of the net periodic cost for retirement and postretirement benefits |  |  |  |  |  |  |
Restructuring Charges |  | $ 24,759 | $ 7,252 | $ 35,768 | $ 32,439 |  |
Non-Restructuring Charges |  | 5,293 |  | 6,313 | 3,917 |  |
Total Realignment Program Charges |  |  |  | 42,081 | 36,356 |  |
Liability recorded |  | 542,705 |  | $ 542,705 |  |  | $ 561,486
Vesting period |  |  |  | 3 years |  |  |
Restricted Stock |  |  |  |  |  |  |
Components of the net periodic cost for retirement and postretirement benefits |  |  |  |  |  |  |
Vesting period |  |  |  | 3 years |  |  |
Subtotal–Reportable Segments |  |  |  |  |  |  |
Components of the net periodic cost for retirement and postretirement benefits |  |  |  |  |  |  |
Restructuring Charges |  | 25,283 |  | $ 36,292 | 32,467 |  |
Non-Restructuring Charges |  | 3,214 |  | 4,517 | 3,225 |  |
Total Realignment Program Charges |  |  |  | 40,809 | 35,692 |  |
Eliminations and All Other |  |  |  |  |  |  |
Components of the net periodic cost for retirement and postretirement benefits |  |  |  |  |  |  |
Restructuring Charges |  | (524) |  | (524) | (28) |  |
Non-Restructuring Charges |  | 2,079 |  | 1,796 | 692 |  |
Total Realignment Program Charges |  |  |  | 1,272 | 664 |  |
FPD |  |  |  |  |  |  |
Components of the net periodic cost for retirement and postretirement benefits |  |  |  |  |  |  |
Restructuring Charges |  | 21,315 |  | 27,539 |  |  |
Non-Restructuring Charges |  | 401 |  | (204) |  |  |
Total Realignment Program Charges |  |  |  | 27,335 |  |  |
FPD | Subtotal–Reportable Segments |  |  |  |  |  |  |
Components of the net periodic cost for retirement and postretirement benefits |  |  |  |  |  |  |
Restructuring Charges |  |  |  |  | 20,499 |  |
Non-Restructuring Charges |  |  |  |  | 1,374 |  |
Total Realignment Program Charges |  |  |  |  | 21,873 |  |
FCD |  |  |  |  |  |  |
Components of the net periodic cost for retirement and postretirement benefits |  |  |  |  |  |  |
Restructuring Charges |  |  |  | 8,753 |  |  |
Non-Restructuring Charges |  |  |  | 4,721 |  |  |
Total Realignment Program Charges |  |  |  | 13,474 |  |  |
Cost of Sales |  |  |  |  |  |  |
Components of the net periodic cost for retirement and postretirement benefits |  |  |  |  |  |  |
Restructuring Charges |  | 22,329 | 5,514 | 35,022 | 17,066 |  |
Non-Restructuring Charges |  | 3,152 |  | 5,578 | 2,940 |  |
Total Realignment Program Charges |  |  |  | 40,600 | 20,006 |  |
Cost of Sales | Subtotal–Reportable Segments |  |  |  |  |  |  |
Components of the net periodic cost for retirement and postretirement benefits |  |  |  |  |  |  |
Restructuring Charges |  | 22,853 |  | 35,546 | 17,066 |  |
Non-Restructuring Charges |  | 3,161 |  | 5,653 | 3,168 |  |
Total Realignment Program Charges |  |  |  | 41,199 | 20,234 |  |
Cost of Sales | Eliminations and All Other |  |  |  |  |  |  |
Components of the net periodic cost for retirement and postretirement benefits |  |  |  |  |  |  |
Restructuring Charges |  | (524) |  | (524) | 0 |  |
Non-Restructuring Charges |  | (9) |  | (75) | (228) |  |
Total Realignment Program Charges |  |  |  | (599) | (228) |  |
Cost of Sales | FPD |  |  |  |  |  |  |
Components of the net periodic cost for retirement and postretirement benefits |  |  |  |  |  |  |
Restructuring Charges |  | 21,105 |  | 25,508 |  |  |
Non-Restructuring Charges |  | 523 |  | 987 |  |  |
Total Realignment Program Charges |  |  |  | 26,495 |  |  |
Cost of Sales | FPD | Subtotal–Reportable Segments |  |  |  |  |  |  |
Components of the net periodic cost for retirement and postretirement benefits |  |  |  |  |  |  |
Restructuring Charges |  |  |  |  | 19,264 |  |
Non-Restructuring Charges |  |  |  |  | 1,573 |  |
Total Realignment Program Charges |  |  |  |  | 20,837 |  |
Cost of Sales | FCD |  |  |  |  |  |  |
Components of the net periodic cost for retirement and postretirement benefits |  |  |  |  |  |  |
Restructuring Charges |  |  |  | 10,038 |  |  |
Non-Restructuring Charges |  |  |  | 4,666 |  |  |
Total Realignment Program Charges |  |  |  | 14,704 |  |  |
Selling, General and Administrative Expenses |  |  |  |  |  |  |
Components of the net periodic cost for retirement and postretirement benefits |  |  |  |  |  |  |
Restructuring Charges |  | 2,430 | 1,738 | 746 | 2,392 |  |
Non-Restructuring Charges |  | 2,141 |  | 735 | 977 |  |
Total Realignment Program Charges |  |  |  | 1,481 | 3,369 |  |
Selling, General and Administrative Expenses | Subtotal–Reportable Segments |  |  |  |  |  |  |
Components of the net periodic cost for retirement and postretirement benefits |  |  |  |  |  |  |
Restructuring Charges |  | 2,430 |  | 746 | 2,420 |  |
Non-Restructuring Charges |  | 53 |  | (1,136) | 57 |  |
Total Realignment Program Charges |  |  |  | (390) | 2,477 |  |
Selling, General and Administrative Expenses | Eliminations and All Other |  |  |  |  |  |  |
Components of the net periodic cost for retirement and postretirement benefits |  |  |  |  |  |  |
Restructuring Charges |  | 0 |  | 0 | (28) |  |
Non-Restructuring Charges |  | 2,088 |  | 1,871 | 920 |  |
Total Realignment Program Charges |  |  |  | 1,871 | 892 |  |
Selling, General and Administrative Expenses | FPD |  |  |  |  |  |  |
Components of the net periodic cost for retirement and postretirement benefits |  |  |  |  |  |  |
Restructuring Charges |  | 210 |  | 2,031 |  |  |
Non-Restructuring Charges |  | (122) |  | (1,191) |  |  |
Total Realignment Program Charges |  |  |  | 840 |  |  |
Selling, General and Administrative Expenses | FPD | Subtotal–Reportable Segments |  |  |  |  |  |  |
Components of the net periodic cost for retirement and postretirement benefits |  |  |  |  |  |  |
Restructuring Charges |  |  |  |  | 1,235 |  |
Non-Restructuring Charges |  |  |  |  | (199) |  |
Total Realignment Program Charges |  |  |  |  | 1,036 |  |
Selling, General and Administrative Expenses | FCD |  |  |  |  |  |  |
Components of the net periodic cost for retirement and postretirement benefits |  |  |  |  |  |  |
Restructuring Charges |  |  |  | (1,285) |  |  |
Non-Restructuring Charges |  |  |  | 55 |  |  |
Total Realignment Program Charges |  |  |  | (1,230) |  |  |
Domestic Plan |  |  |  |  |  |  |
Components of the net periodic cost for retirement and postretirement benefits |  |  |  |  |  |  |
Service cost |  | 200 | 6,000 | 600 | 18,000 |  |
Interest cost |  | 5,500 | 5,200 | 16,400 | 15,600 |  |
Expected return on plan assets |  | (5,800) | (5,800) | (17,300) | (17,400) |  |
Amortization of unrecognized prior service cost and other costs |  | 0 | 0 | 100 | 0 |  |
Amortization of unrecognized net loss (gain) |  | 100 | 0 | 300 | 0 |  |
Net periodic cost recognized |  | 1,500 | 5,400 | 4,600 | 16,200 |  |
Settlement loss |  | 1,500 | 0 | 4,500 | 0 |  |
Liability recorded |  |  |  |  |  | $ 5,000 |
Domestic Plan | Maximum | Forecast |  |  |  |  |  |  |
Components of the net periodic cost for retirement and postretirement benefits |  |  |  |  |  |  |
Settlement loss | $ 6,000 |  |  |  |  |  |
Domestic Plan | Minimum | Forecast |  |  |  |  |  |  |
Components of the net periodic cost for retirement and postretirement benefits |  |  |  |  |  |  |
Settlement loss | $ 5,000 |  |  |  |  |  |
Foreign Plan |  |  |  |  |  |  |
Components of the net periodic cost for retirement and postretirement benefits |  |  |  |  |  |  |
Service cost |  | 1,600 | 1,300 | 4,800 | 3,900 |  |
Interest cost |  | 3,500 | 3,200 | 10,400 | 9,200 |  |
Expected return on plan assets |  | (2,000) | (2,100) | (6,200) | (6,000) |  |
Amortization of unrecognized prior service cost and other costs |  | (100) | 100 | 100 | 300 |  |
Amortization of unrecognized net loss (gain) |  | 600 | 700 | 1,700 | 2,000 |  |
Net periodic cost recognized |  | 3,600 | 3,200 | 10,800 | 9,400 |  |
Settlement loss |  | 0 | 0 | 0 | 0 |  |
Postretirement Medical Benefits |  |  |  |  |  |  |
Components of the net periodic cost for retirement and postretirement benefits |  |  |  |  |  |  |
Service cost |  | 0 | 0 | 0 | 0 |  |
Interest cost |  | 200 | 200 | 400 | 500 |  |
Expected return on plan assets |  | 0 | 0 | 0 | 0 |  |
Amortization of unrecognized prior service cost and other costs |  | 0 | 0 | 100 | 100 |  |
Amortization of unrecognized net loss (gain) |  | (100) | 100 | (300) | 100 |  |
Net periodic cost recognized |  | 100 | 300 | 200 | 700 |  |
Settlement loss |  | $ 0 | $ 0 | $ 0 | $ 0 |  |

X
- Definition Non-Restructuring Charges (Benefits) + References No definition available. + Details
Name: | fls_NonRestructuringChargesBenefits
Namespace Prefix: | fls_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Realignment Program Charges (Benefits) + References No definition available. + Details
Name: | fls_RealignmentProgramChargesBenefits
Namespace Prefix: | fls_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(20)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_AccruedLiabilitiesCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
Name: | us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(5) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(5) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
Name: | us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
Name: | us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of cost recognized for passage of time related to defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
Name: | us-gaap_DefinedBenefitPlanInterestCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (q) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
Name: | us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(7) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(7) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
Name: | us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
Name: | us-gaap_DefinedBenefitPlanServiceCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147476153/220-40-55-18 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4.b.1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482047/420-10-45-3 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479823/420-10-S99-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 21 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147476148/220-40-50-21 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147476148/220-40-50-6 + Details
Name: | us-gaap_RestructuringCharges
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_RestrictedStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidationItemsAxis=us-gaap_OperatingSegmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidationItemsAxis=us-gaap_IntersegmentEliminationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=fls_FPDMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=fls_FlowControlDivisionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_CostOfSalesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_SellingGeneralAndAdministrativeExpensesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_DomesticPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_ForeignPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |