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Postretirement and Other Benefits - Target Allocations (Details)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
United States, Pension Benefits [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Target allocations 2017 100.00%  
Actual allocations 100.00% 100.00%
United States, Pension Benefits [Member] | Cash and Cash Equivalents [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Target allocations 2017 1.00%  
Actual allocations 1.00% 1.00%
United States, Pension Benefits [Member] | Domestic Large Cap [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Target allocations 2017 [1] 7.00%  
Actual allocations [1] 7.00% 7.00%
United States, Pension Benefits [Member] | Domestic Small Cap [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Target allocations 2017 [1] 4.00%  
Actual allocations [1] 5.00% 4.00%
United States, Pension Benefits [Member] | International [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Target allocations 2017 [1] 20.00%  
Actual allocations [1] 20.00% 19.00%
United States, Pension Benefits [Member] | Fixed Income Securities [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Target allocations 2017 68.00%  
Actual allocations 67.00% 69.00%
United States, Pension Benefits [Member] | Alternative Investment [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Target allocations 2017 [2] 0.00%  
Actual allocations [2] 0.00% 0.00%
France, Pension Benefits [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Actual allocations 100.00% 100.00%
France, Pension Benefits [Member] | Cash and Cash Equivalents [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Actual allocations 24.00% 12.00%
France, Pension Benefits [Member] | Domestic Large Cap [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Actual allocations [1] 20.00% 20.00%
France, Pension Benefits [Member] | Domestic Small Cap [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Actual allocations [1] 0.00% 0.00%
France, Pension Benefits [Member] | International [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Actual allocations [1] 0.00% 0.00%
France, Pension Benefits [Member] | Fixed Income Securities [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Actual allocations 54.00% 66.00%
France, Pension Benefits [Member] | Alternative Investment [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Actual allocations [2] 2.00% 2.00%
[1] None of the Company's pension plan assets are targeted for investment in SWM stock, except that it is possible that one or more mutual funds held by the plan could hold shares of SWM.
[2] Investments in this category under the U.S. pension plan only may include hedge funds, and may include real estate under the French pension plan.