2.2.0.25truefalse40601 - Disclosure - Pensions and Other Postretirement Benefits (Pension benefits contributions) (Details)truefalseIn Thousandsfalse1falsefalseUSDtruefalse{us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis} : Non-U.S. Pension Plan [Member] 1/1/2011 - 3/31/2011 USD ($) $Duration_1_1_2011_To_3_31_2011_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_us-gaap_ForeignPensionPlansDefinedBenefitMemberhttp://www.sec.gov/CIK0001130385duration2011-01-01T00:00:002011-03-31T00:00:00falsefalseNon-U.S. Pension Plan [Member]us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ForeignPensionPlansDefinedBenefitMemberus-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2falsefalseUSDtruefalse{us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis} : Non-U.S. Pension Plan [Member] 12/31/2011 USD ($) $As_Of_12_31_2011_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_us-gaap_ForeignPensionPlansDefinedBenefitMemberhttp://www.sec.gov/CIK0001130385instant2011-12-31T00:00:000001-01-01T00:00:00falsefalseNon-U.S. Pension Plan [Member]us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_ForeignPensionPlansDefinedBenefitMemberus-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2false0us-gaap_DefinedBenefitPlanContributionsByEmployerus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse39000003900falsetruefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe amount of contributions made by the employer.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b falsefalseContributions made through fiscal period end3false0fwlt_DefinedBenefitPlanExpectedRemainingEmployerContributionsForPeriodfwltfalsecreditinstantThe employer's best estimate of contributions expected to be paid to the plan for the remainder of the fiscal year. Estimated...falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse2030000020300falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe employer's best estimate of contributions expected to be paid to the plan for the remainder of the fiscal year. Estimated contributions may be presented in the aggregate combining (1) contributions required by the funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions.No authoritative reference available.falsefalseRemaining contributions expected for fiscal year 20114false0fwlt_DefinedBenefitPlanEstimatedFutureEmployerContributionsCurrentFiscalYearfwltfalsedebitinstantThe employer's best estimate of contributions expected to be paid to the plan in the current fiscal year. Estimated...falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse2420000024200falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe employer's best estimate of contributions expected to be paid to the plan in the current fiscal year. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions.No authoritative reference available.falsefalseContributions expected for fiscal year 201123Pensions and Other Postretirement Benefits (Pension benefits contributions) (Details) (Non-U.S. Pension Plan [Member], USD $)ThousandsUnKnownUnKnownUnKnownfalsetrue