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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Related Party Transaction [Line Items]          
Annual management consulting fee waived       $ 3.0  
Shared Services Costs Incurred by Hexion       23.0  
Shared Services Costs Incurred by MPM       17.0  
Shared Services Net Billings - Hexion to MPM       11.0  
Settlement note $ 2.5        
Apollo Affiliates and Other Related Parties [Member]          
Related Party Transaction [Line Items]          
Revenue from Related Parties 1.0 $ 1.0   2.0  
Accounts Receivable, Related Parties         $ 0.0
Apollo [Member]          
Related Party Transaction [Line Items]          
Annual management consulting fee       $ 3.0  
Annual management consulting fee percentage       2.00%  
Related Party Costs   1.0   $ 2.0  
Momentive Performance Materials Inc. [Member]          
Related Party Transaction [Line Items]          
Revenue from Related Parties   1.0      
Revenues from distribution agreement 1.0     1.0  
Accounts Receivable, Related Parties         2.0
Accounts Payable, Related Parties         3.0
Other joint ventures unconsolidated [Member]          
Related Party Transaction [Line Items]          
Revenue from Related Parties 0.0 1.0 $ 2.0 7.0  
Accounts Receivable, Related Parties 0.0       2.0
Accounts Payable, Related Parties 1.0       1.0
Purchases from JV 1.0 $ 0.0 $ 2.0 $ 5.0  
Loans and Leases Receivable, Related Parties $ 8.0       $ 7.0