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3/31/2011 USD ($) $Duration_1_1_2011_To_3_31_2011_us-gaap_StatementGeographicalAxis_fwlt_UnitedStatesMemberhttp://www.sec.gov/CIK0001130385duration2011-01-01T00:00:002011-03-31T00:00:00falsefalseUnited States [Member]us-gaap_StatementGeographicalAxisxbrldihttp://xbrl.org/2006/xbrldifwlt_UnitedStatesMemberus-gaap_StatementGeographicalAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit13Standardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$4falsefalseUSDtruefalse{us-gaap_StatementGeographicalAxis} : United States [Member] 1/1/2010 - 3/31/2010 USD ($) $Duration_1_1_2010_To_3_31_2010_us-gaap_StatementGeographicalAxis_fwlt_UnitedStatesMemberhttp://www.sec.gov/CIK0001130385duration2010-01-01T00:00:002010-03-31T00:00:00falsefalseUnited States [Member]us-gaap_StatementGeographicalAxisxbrldihttp://xbrl.org/2006/xbrldifwlt_UnitedStatesMemberus-gaap_StatementGeographicalAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit13Standardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseUnited States [Member]4false0fwlt_AsbestosRelatedAccrualCarryingValueProvisionfwltfalsedebitdurationThe charge against earnings in the period to increase asbestos-related reserves, net of any adjustments to increase...falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse20000002000falsefalsefalsefalsefalse2truefalsefalse32450003245falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe charge against earnings in the period to increase asbestos-related reserves, net of any adjustments to increase asbestos-related assets or to reduce previously estimated charges.No authoritative reference available.falsefalseProvision for revaluation5false0fwlt_GainLossRelatedToSettlementWithAsbestosInsurersfwltfalsecreditdurationThe amount of increase of the asbestos-related insurance asset and corresponding gain as a result of settlements with...falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truefalsefalse-1600000-1600falsefalsefalsefalsefalse2truefalsefalse-3992000-3992falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe amount of increase of the asbestos-related insurance asset and corresponding gain as a result of settlements with insurers.No authoritative reference available.falsefalseGain on settlement of coverage litigation6false0fwlt_NetAsbestosRelatedProvisionGainfwltfalsedebitdurationNet (gain)/loss for charges on the revaluation of the asbestos liability and related asset.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse400000400falsetruefalsefalsefalse2truefalsefalse-747000-747falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNet (gain)/loss for charges on the revaluation of the asbestos liability and related asset.No authoritative reference available.truefalseNet asbestos-related provision/(gain)25Litigation and Uncertainties (Summary of asbestos related provision activity - 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