Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Related Party Transaction [Line Items]
Annual management consulting fee waived				$ 3.0
Settlement note	$ 2.5		$ 2.5
Apollo Affiliates and Other Related Parties [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties	1.0	$ 0.0	1.0	1.0
Accounts Receivable, Related Parties	1.0		1.0		$ 1.0
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
Subsidiary of Common Parent [Member]
Related Party Transaction [Line Items]
Shared Services Costs Incurred by MPM			14.0	14.0
Momentive Performance Materials Inc. [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties		1.0
Related Party Transaction, Purchases from Related Party	3.0	9.0	10.0	16.0
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	1.0	3.0	2.0	6.0
Accounts Receivable, Related Parties	3.0		3.0		2.0
Accounts Payable, Related Parties	1.0		1.0		$ 1.0
Purchases from JV	1.0	$ 3.0	2.0	5.0
Loans and Leases Receivable, Related Parties	$ 7.0		7.0
Hexion Inc. [Member]
Related Party Transaction [Line Items]
Shared Services Costs Incurred by Hexion			15.0	19.0
Shared Services Net Billings - Hexion to MPM			$ 11.0	$ 0.0