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Segment Information (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 segment | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of Operating Segments |  |  |  |  |  |  |  |  | 3 us-gaap_NumberOfOperatingSegments |  |
Net Sales [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Sales | $ 181.7 us-gaap_SalesRevenueGoodsNet | $ 204.3 us-gaap_SalesRevenueGoodsNet | $ 203.6 us-gaap_SalesRevenueGoodsNet | $ 204.7 us-gaap_SalesRevenueGoodsNet | $ 196.5 us-gaap_SalesRevenueGoodsNet | $ 185.3 us-gaap_SalesRevenueGoodsNet | $ 196.5 us-gaap_SalesRevenueGoodsNet | $ 194.5 us-gaap_SalesRevenueGoodsNet | $ 794.3 us-gaap_SalesRevenueGoodsNet | $ 772.8 us-gaap_SalesRevenueGoodsNet | $ 778.5 us-gaap_SalesRevenueGoodsNet
Percentage of Net Sales |  |  |  |  |  |  |  |  | 100.00%swm_SalesRevenueNetPercentage | 100.00%swm_SalesRevenueNetPercentage | 100.00%swm_SalesRevenueNetPercentage
Operating Profit [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating Profit (loss) | 17.3 us-gaap_OperatingIncomeLoss | 25.2 us-gaap_OperatingIncomeLoss | 30.5 us-gaap_OperatingIncomeLoss | 33.1 us-gaap_OperatingIncomeLoss | (0.7)us-gaap_OperatingIncomeLoss | 41.8 us-gaap_OperatingIncomeLoss | 42.1 us-gaap_OperatingIncomeLoss | 41.7 us-gaap_OperatingIncomeLoss | 106.1 us-gaap_OperatingIncomeLoss | 124.9 us-gaap_OperatingIncomeLoss | 151.7 us-gaap_OperatingIncomeLoss
Percentage of Operating Profit |  |  |  |  |  |  |  |  | 100.00%swm_OperatingProfitPercentage | 100.00%swm_OperatingProfitPercentage | 100.00%swm_OperatingProfitPercentage
Segment Assets | 1,186.6 us-gaap_Assets |  |  |  | 1,226.8 us-gaap_Assets |  |  |  | 1,186.6 us-gaap_Assets | 1,226.8 us-gaap_Assets |
Capital Spending |  |  |  |  |  |  |  |  | 35.1 us-gaap_PaymentsToAcquireProductiveAssets | 29.1 us-gaap_PaymentsToAcquireProductiveAssets | 27.2 us-gaap_PaymentsToAcquireProductiveAssets
Depreciation |  |  |  |  |  |  |  |  | 35.3 us-gaap_Depreciation | 31.1 us-gaap_Depreciation | 30.8 us-gaap_Depreciation
Europe and the former Commonwealth of Independent States [Member] |  |  |  |  |  |  |  |  |  |  |
Net Sales [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 304.6 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = swm_EuropeandtheformerCommonwealthofIndependentStatesMember | 343.0 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = swm_EuropeandtheformerCommonwealthofIndependentStatesMember | 349.4 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = swm_EuropeandtheformerCommonwealthofIndependentStatesMember
United States [Member] |  |  |  |  |  |  |  |  |  |  |
Net Sales [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 263.7 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_US | 223.1 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_US | 227.2 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_US
Operating Profit [Abstract] |  |  |  |  |  |  |  |  |  |  |
Long-Lived Assets | 75.5 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US |  |  |  | 86.8 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US |  |  |  | 75.5 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US | 86.8 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US |
France [Member] |  |  |  |  |  |  |  |  |  |  |
Operating Profit [Abstract] |  |  |  |  |  |  |  |  |  |  |
Long-Lived Assets | 187.2 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_FR |  |  |  | 210.2 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_FR |  |  |  | 187.2 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_FR | 210.2 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_FR |
Philippines [Member] |  |  |  |  |  |  |  |  |  |  |
Operating Profit [Abstract] |  |  |  |  |  |  |  |  |  |  |
Long-Lived Assets | 30.8 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_PH |  |  |  | 31.5 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_PH |  |  |  | 30.8 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_PH | 31.5 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_PH |
Brazil [Member] |  |  |  |  |  |  |  |  |  |  |
Operating Profit [Abstract] |  |  |  |  |  |  |  |  |  |  |
Long-Lived Assets | 27.8 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_BR |  |  |  | 35.1 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_BR |  |  |  | 27.8 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_BR | 35.1 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_BR |
Poland [Member] |  |  |  |  |  |  |  |  |  |  |
Operating Profit [Abstract] |  |  |  |  |  |  |  |  |  |  |
Long-Lived Assets | 29.0 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_PL |  |  |  | 32.8 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_PL |  |  |  | 29.0 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_PL | 32.8 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_PL |
Asia/Pacific (including China) [Member] |  |  |  |  |  |  |  |  |  |  |
Net Sales [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 125.3 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = swm_SegmentGeographicalGroupsOfCountriesGroupFourMember | 113.6 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = swm_SegmentGeographicalGroupsOfCountriesGroupFourMember | 107.4 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = swm_SegmentGeographicalGroupsOfCountriesGroupFourMember
Latin America [Member] |  |  |  |  |  |  |  |  |  |  |
Net Sales [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 54.9 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = swm_SegmentGeographicalGroupsOfCountriesGroupThreeMember | 49.6 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = swm_SegmentGeographicalGroupsOfCountriesGroupThreeMember | 54.2 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = swm_SegmentGeographicalGroupsOfCountriesGroupThreeMember
Other foreign countries [Member] |  |  |  |  |  |  |  |  |  |  |
Net Sales [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 45.8 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = swm_OtherForeignCountriesMember | 43.5 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = swm_OtherForeignCountriesMember | 40.3 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = swm_OtherForeignCountriesMember
Operating Profit [Abstract] |  |  |  |  |  |  |  |  |  |  |
Long-Lived Assets | 15.5 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = swm_OtherForeignCountriesMember |  |  |  | 3.6 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = swm_OtherForeignCountriesMember |  |  |  | 15.5 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = swm_OtherForeignCountriesMember | 3.6 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = swm_OtherForeignCountriesMember |
Paper [Member] |  |  |  |  |  |  |  |  |  |  |
Net Sales [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 496.3 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = swm_PaperSegmentMember | 543.4 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = swm_PaperSegmentMember | 545.0 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = swm_PaperSegmentMember
Percentage of Net Sales |  |  |  |  |  |  |  |  | 62.50%swm_SalesRevenueNetPercentage / us-gaap_StatementBusinessSegmentsAxis = swm_PaperSegmentMember | 70.30%swm_SalesRevenueNetPercentage / us-gaap_StatementBusinessSegmentsAxis = swm_PaperSegmentMember | 70.00%swm_SalesRevenueNetPercentage / us-gaap_StatementBusinessSegmentsAxis = swm_PaperSegmentMember
Operating Profit [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating Profit (loss) |  |  |  |  |  |  |  |  | 74.5 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = swm_PaperSegmentMember | 102.5 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = swm_PaperSegmentMember | 84.4 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = swm_PaperSegmentMember
Percentage of Operating Profit |  |  |  |  |  |  |  |  | 70.20%swm_OperatingProfitPercentage / us-gaap_StatementBusinessSegmentsAxis = swm_PaperSegmentMember | 82.10%swm_OperatingProfitPercentage / us-gaap_StatementBusinessSegmentsAxis = swm_PaperSegmentMember | 55.70%swm_OperatingProfitPercentage / us-gaap_StatementBusinessSegmentsAxis = swm_PaperSegmentMember
Segment Assets | 425.6 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = swm_PaperSegmentMember |  |  |  | 462.4 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = swm_PaperSegmentMember |  |  |  | 425.6 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = swm_PaperSegmentMember | 462.4 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = swm_PaperSegmentMember |
Capital Spending |  |  |  |  |  |  |  |  | 20.3 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = swm_PaperSegmentMember | 19.8 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = swm_PaperSegmentMember | 19.8 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = swm_PaperSegmentMember
Depreciation |  |  |  |  |  |  |  |  | 20.9 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = swm_PaperSegmentMember | 20.0 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = swm_PaperSegmentMember | 20.0 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = swm_PaperSegmentMember
Reconstituted Tobacco [Member] |  |  |  |  |  |  |  |  |  |  |
Net Sales [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 170.6 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = swm_ReconstitutedTobaccoMember | 225.2 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = swm_ReconstitutedTobaccoMember | 233.5 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = swm_ReconstitutedTobaccoMember
Percentage of Net Sales |  |  |  |  |  |  |  |  | 21.50%swm_SalesRevenueNetPercentage / us-gaap_StatementBusinessSegmentsAxis = swm_ReconstitutedTobaccoMember | 29.10%swm_SalesRevenueNetPercentage / us-gaap_StatementBusinessSegmentsAxis = swm_ReconstitutedTobaccoMember | 30.00%swm_SalesRevenueNetPercentage / us-gaap_StatementBusinessSegmentsAxis = swm_ReconstitutedTobaccoMember
Operating Profit [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating Profit (loss) |  |  |  |  |  |  |  |  | 50.0 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = swm_ReconstitutedTobaccoMember | 46.4 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = swm_ReconstitutedTobaccoMember | 90.3 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = swm_ReconstitutedTobaccoMember
Percentage of Operating Profit |  |  |  |  |  |  |  |  | 47.10%swm_OperatingProfitPercentage / us-gaap_StatementBusinessSegmentsAxis = swm_ReconstitutedTobaccoMember | 37.10%swm_OperatingProfitPercentage / us-gaap_StatementBusinessSegmentsAxis = swm_ReconstitutedTobaccoMember | 59.50%swm_OperatingProfitPercentage / us-gaap_StatementBusinessSegmentsAxis = swm_ReconstitutedTobaccoMember
Segment Assets | 186.3 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = swm_ReconstitutedTobaccoMember |  |  |  | 411.4 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = swm_ReconstitutedTobaccoMember |  |  |  | 186.3 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = swm_ReconstitutedTobaccoMember | 411.4 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = swm_ReconstitutedTobaccoMember |
Capital Spending |  |  |  |  |  |  |  |  | 5.8 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = swm_ReconstitutedTobaccoMember | 8.6 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = swm_ReconstitutedTobaccoMember | 7.4 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = swm_ReconstitutedTobaccoMember
Depreciation |  |  |  |  |  |  |  |  | 10.1 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = swm_ReconstitutedTobaccoMember | 10.5 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = swm_ReconstitutedTobaccoMember | 10.0 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = swm_ReconstitutedTobaccoMember
Filtration [Member] |  |  |  |  |  |  |  |  |  |  |
Net Sales [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 127.4 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = swm_FiltrationSegmentMember | 4.2 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = swm_FiltrationSegmentMember | 0 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = swm_FiltrationSegmentMember
Percentage of Net Sales |  |  |  |  |  |  |  |  | 16.00%swm_SalesRevenueNetPercentage / us-gaap_StatementBusinessSegmentsAxis = swm_FiltrationSegmentMember | 0.60%swm_SalesRevenueNetPercentage / us-gaap_StatementBusinessSegmentsAxis = swm_FiltrationSegmentMember | 0.00%swm_SalesRevenueNetPercentage / us-gaap_StatementBusinessSegmentsAxis = swm_FiltrationSegmentMember
Operating Profit [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating Profit (loss) |  |  |  |  |  |  |  |  | 10.2 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = swm_FiltrationSegmentMember | (1.1)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = swm_FiltrationSegmentMember | 0 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = swm_FiltrationSegmentMember
Percentage of Operating Profit |  |  |  |  |  |  |  |  | 9.60%swm_OperatingProfitPercentage / us-gaap_StatementBusinessSegmentsAxis = swm_FiltrationSegmentMember | (0.90%)swm_OperatingProfitPercentage / us-gaap_StatementBusinessSegmentsAxis = swm_FiltrationSegmentMember | 0.00%swm_OperatingProfitPercentage / us-gaap_StatementBusinessSegmentsAxis = swm_FiltrationSegmentMember
Segment Assets | 319.5 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = swm_FiltrationSegmentMember |  |  |  | 286.3 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = swm_FiltrationSegmentMember |  |  |  | 319.5 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = swm_FiltrationSegmentMember | 286.3 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = swm_FiltrationSegmentMember |
Capital Spending |  |  |  |  |  |  |  |  | 8.7 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = swm_FiltrationSegmentMember | 0.7 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = swm_FiltrationSegmentMember | 0 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = swm_FiltrationSegmentMember
Depreciation |  |  |  |  |  |  |  |  | 3.9 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = swm_FiltrationSegmentMember | 0.1 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = swm_FiltrationSegmentMember | 0 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = swm_FiltrationSegmentMember
Unallocated [Member] |  |  |  |  |  |  |  |  |  |  |
Operating Profit [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating Profit (loss) |  |  |  |  |  |  |  |  | (28.6)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MaterialReconcilingItemsMember | (22.9)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MaterialReconcilingItemsMember | (23.0)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MaterialReconcilingItemsMember
Percentage of Operating Profit |  |  |  |  |  |  |  |  | (26.90%)swm_OperatingProfitPercentage / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MaterialReconcilingItemsMember | (18.30%)swm_OperatingProfitPercentage / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MaterialReconcilingItemsMember | (15.20%)swm_OperatingProfitPercentage / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MaterialReconcilingItemsMember
Segment Assets | 255.2 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MaterialReconcilingItemsMember |  |  |  | 66.7 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MaterialReconcilingItemsMember |  |  |  | 255.2 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MaterialReconcilingItemsMember | 66.7 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MaterialReconcilingItemsMember |
Capital Spending |  |  |  |  |  |  |  |  | 0.3 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MaterialReconcilingItemsMember | 0 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MaterialReconcilingItemsMember | 0 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MaterialReconcilingItemsMember
Depreciation |  |  |  |  |  |  |  |  | $ 0.4 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MaterialReconcilingItemsMember | $ 0.5 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MaterialReconcilingItemsMember | $ 0.8 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MaterialReconcilingItemsMember

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