Employee Benefit Plans - Investment Strategy (Details) - Pension Plan [Member]	Dec. 31, 2017	Dec. 31, 2016
Domestic Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension Plan Assets, Investment Strategy	100.00%	100.00%
Foreign Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension Plan Assets, Investment Strategy	100.00%	100.00%
Equity Securities [Member] | Domestic Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension Plan Assets, Investment Strategy	12.00%	30.00%
Equity Securities [Member] | Foreign Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension Plan Assets, Investment Strategy	24.00%	28.00%
Fixed Income Securities [Member] | Domestic Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension Plan Assets, Investment Strategy	73.00%	48.00%
Fixed Income Securities [Member] | Foreign Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension Plan Assets, Investment Strategy	45.00%	45.00%
Real estate [Member] | Domestic Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension Plan Assets, Investment Strategy	3.00%	6.00%
Real estate [Member] | Foreign Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension Plan Assets, Investment Strategy	5.00%	5.00%
Private Equity Or Venture Capital [Member] | Domestic Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension Plan Assets, Investment Strategy	6.00%	8.00%
Private Equity Or Venture Capital [Member] | Foreign Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension Plan Assets, Investment Strategy	12.00%	9.00%
Other Assets [Member] | Domestic Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension Plan Assets, Investment Strategy	6.00%	8.00%
Other Assets [Member] | Foreign Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension Plan Assets, Investment Strategy	14.00%	13.00%