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Debt Schedule of Debt Summarized (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Total $ 442.8us-gaap_LongTermDebt $ 440.1us-gaap_LongTermDebt
Less: Current debt (3.2)us-gaap_LongTermDebtCurrent (2.9)us-gaap_LongTermDebtCurrent
Long-Term Debt 439.6us-gaap_LongTermDebtNoncurrent 437.2us-gaap_LongTermDebtNoncurrent
French Employee Profit Sharing [Member]    
Debt Instrument [Line Items]    
Total 13.0us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember
14.6us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember
Bank Overdrafts [Member]    
Debt Instrument [Line Items]    
Total 0.9us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BankOverdraftsMember
0.4us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BankOverdraftsMember
Euro Revolver [Member] | Line of Credit [Member]    
Debt Instrument [Line Items]    
Total 62.9us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= swm_EuroRevolverMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
71.1us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= swm_EuroRevolverMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
US Revolver [Member] | Line of Credit [Member]    
Debt Instrument [Line Items]    
Total $ 366.0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= swm_UsRevolverMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
$ 354.0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= swm_UsRevolverMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember