Income Taxes (Reconciliation of the U.S. Statutory Income Tax Rate to Effective Tax Rate) (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Abstract]
Statutory U.S. income tax rate	21.00%	35.00%	35.00%
State income tax (benefit), net of federal effect	0.90%	0.80%	(0.30%)
Global intangible low-taxed income	3.60%
Repatriation tax on accumulated previously untaxed foreign earnings	(1.20%)	67.40%
Remeasurement of deferred tax assets and liabilities	(0.10%)	21.00%
Rate difference on foreign earnings	(2.30%)	(3.90%)	(9.20%)
Preliminary IRS settlement of 2013-2014 tax years	11.50%
Equity earnings impact		0.10%	(0.40%)
Valuation allowance	(3.80%)	6.80%	1.20%
Realignment of Dow Corning interest			(28.20%)
Other items, net	(0.50%)	2.80%	1.80%
Effective income tax rate (benefit)	29.10%	130.00%	(0.10%)